diff --git a/src/data/arena-tag.ts b/src/data/arena-tag.ts
index ff939194bcd..7d78076e06b 100644
--- a/src/data/arena-tag.ts
+++ b/src/data/arena-tag.ts
@@ -84,6 +84,10 @@ interface BaseArenaTag {
    * The tag's remaining duration. Setting to any number `<=0` will make the tag's duration effectively infinite.
    */
   turnCount: number;
+  /**
+   * The tag's max duration.
+   */
+  maxDuration: number;
   /**
    * The {@linkcode MoveId} that created this tag, or `undefined` if not set by a move.
    */
@@ -110,12 +114,14 @@ export abstract class ArenaTag implements BaseArenaTag {
   /** The type of the arena tag */
   public abstract readonly tagType: ArenaTagType;
   public turnCount: number;
+  public maxDuration: number;
   public sourceMove?: MoveId;
   public sourceId: number | undefined;
   public side: ArenaTagSide;
 
   constructor(turnCount: number, sourceMove?: MoveId, sourceId?: number, side: ArenaTagSide = ArenaTagSide.BOTH) {
     this.turnCount = turnCount;
+    this.maxDuration = turnCount;
     this.sourceMove = sourceMove;
     this.sourceId = sourceId;
     this.side = side;
@@ -164,6 +170,7 @@ export abstract class ArenaTag implements BaseArenaTag {
    */
   loadTag<const T extends this>(source: BaseArenaTag & Pick<T, "tagType">): void {
     this.turnCount = source.turnCount;
+    this.maxDuration = source.maxDuration;
     this.sourceMove = source.sourceMove;
     this.sourceId = source.sourceId;
     this.side = source.side;
diff --git a/src/data/terrain.ts b/src/data/terrain.ts
index 139230605bf..315ed919e03 100644
--- a/src/data/terrain.ts
+++ b/src/data/terrain.ts
@@ -22,10 +22,12 @@ export interface SerializedTerrain {
 export class Terrain {
   public terrainType: TerrainType;
   public turnsLeft: number;
+  public maxDuration: number;
 
-  constructor(terrainType: TerrainType, turnsLeft?: number) {
+  constructor(terrainType: TerrainType, turnsLeft = 0, maxDuration: number = turnsLeft) {
     this.terrainType = terrainType;
-    this.turnsLeft = turnsLeft || 0;
+    this.turnsLeft = turnsLeft;
+    this.maxDuration = maxDuration;
   }
 
   lapse(): boolean {
diff --git a/src/data/weather.ts b/src/data/weather.ts
index 84a5e1ba4f8..49af505dc62 100644
--- a/src/data/weather.ts
+++ b/src/data/weather.ts
@@ -19,10 +19,12 @@ export interface SerializedWeather {
 export class Weather {
   public weatherType: WeatherType;
   public turnsLeft: number;
+  public maxDuration: number;
 
-  constructor(weatherType: WeatherType, turnsLeft?: number) {
+  constructor(weatherType: WeatherType, turnsLeft = 0, maxDuration: number = turnsLeft) {
     this.weatherType = weatherType;
-    this.turnsLeft = !this.isImmutable() ? turnsLeft || 0 : 0;
+    this.turnsLeft = this.isImmutable() ? 0 : turnsLeft;
+    this.maxDuration = this.isImmutable() ? 0 : maxDuration;
   }
 
   lapse(): boolean {
diff --git a/src/events/arena.ts b/src/events/arena.ts
index cf287de3176..9f818a36c89 100644
--- a/src/events/arena.ts
+++ b/src/events/arena.ts
@@ -20,10 +20,13 @@ export enum ArenaEventType {
 export class ArenaEvent extends Event {
   /** The total duration of the {@linkcode ArenaEventType} */
   public duration: number;
-  constructor(eventType: ArenaEventType, duration: number) {
+  /** The maximum duration of the {@linkcode ArenaEventType} */
+  public maxDuration: number;
+  constructor(eventType: ArenaEventType, duration: number, maxDuration: number = duration) {
     super(eventType);
 
     this.duration = duration;
+    this.maxDuration = maxDuration;
   }
 }
 /** Container class for {@linkcode ArenaEventType.WEATHER_CHANGED} events */
@@ -32,8 +35,8 @@ export class WeatherChangedEvent extends ArenaEvent {
   public oldWeatherType: WeatherType;
   /** The {@linkcode WeatherType} being set */
   public newWeatherType: WeatherType;
-  constructor(oldWeatherType: WeatherType, newWeatherType: WeatherType, duration: number) {
-    super(ArenaEventType.WEATHER_CHANGED, duration);
+  constructor(oldWeatherType: WeatherType, newWeatherType: WeatherType, duration: number, maxDuration?: number) {
+    super(ArenaEventType.WEATHER_CHANGED, duration, maxDuration);
 
     this.oldWeatherType = oldWeatherType;
     this.newWeatherType = newWeatherType;
@@ -45,8 +48,8 @@ export class TerrainChangedEvent extends ArenaEvent {
   public oldTerrainType: TerrainType;
   /** The {@linkcode TerrainType} being set */
   public newTerrainType: TerrainType;
-  constructor(oldTerrainType: TerrainType, newTerrainType: TerrainType, duration: number) {
-    super(ArenaEventType.TERRAIN_CHANGED, duration);
+  constructor(oldTerrainType: TerrainType, newTerrainType: TerrainType, duration: number, maxDuration?: number) {
+    super(ArenaEventType.TERRAIN_CHANGED, duration, maxDuration);
 
     this.oldTerrainType = oldTerrainType;
     this.newTerrainType = newTerrainType;
@@ -68,10 +71,11 @@ export class TagAddedEvent extends ArenaEvent {
     arenaTagType: ArenaTagType,
     arenaTagSide: ArenaTagSide,
     duration: number,
+    maxDuration?: number,
     arenaTagLayers?: number,
     arenaTagMaxLayers?: number,
   ) {
-    super(ArenaEventType.TAG_ADDED, duration);
+    super(ArenaEventType.TAG_ADDED, duration, maxDuration);
 
     this.arenaTagType = arenaTagType;
     this.arenaTagSide = arenaTagSide;
diff --git a/src/field/arena.ts b/src/field/arena.ts
index c4708be1336..5ab50e540ee 100644
--- a/src/field/arena.ts
+++ b/src/field/arena.ts
@@ -344,7 +344,7 @@ export class Arena {
       globalScene.applyModifier(FieldEffectModifier, user.isPlayer(), user, weatherDuration);
     }
 
-    this.weather = weather ? new Weather(weather, weatherDuration.value) : null;
+    this.weather = weather ? new Weather(weather, weatherDuration.value, weatherDuration.value) : null;
     this.eventTarget.dispatchEvent(
       new WeatherChangedEvent(oldWeatherType, this.weather?.weatherType!, this.weather?.turnsLeft!),
     ); // TODO: is this bang correct?
@@ -425,7 +425,7 @@ export class Arena {
       globalScene.applyModifier(FieldEffectModifier, user.isPlayer(), user, terrainDuration);
     }
 
-    this.terrain = terrain ? new Terrain(terrain, terrainDuration.value) : null;
+    this.terrain = terrain ? new Terrain(terrain, terrainDuration.value, terrainDuration.value) : null;
 
     this.eventTarget.dispatchEvent(
       new TerrainChangedEvent(oldTerrainType, this.terrain?.terrainType!, this.terrain?.turnsLeft!),
@@ -705,8 +705,8 @@ export class Arena {
       existingTag.onOverlap(this, globalScene.getPokemonById(sourceId));
 
       if (existingTag instanceof EntryHazardTag) {
-        const { tagType, side, turnCount, layers, maxLayers } = existingTag as EntryHazardTag;
-        this.eventTarget.dispatchEvent(new TagAddedEvent(tagType, side, turnCount, layers, maxLayers));
+        const { tagType, side, turnCount, maxDuration, layers, maxLayers } = existingTag as EntryHazardTag;
+        this.eventTarget.dispatchEvent(new TagAddedEvent(tagType, side, turnCount, maxDuration, layers, maxLayers));
       }
 
       return false;
@@ -721,7 +721,7 @@ export class Arena {
       const { layers = 0, maxLayers = 0 } = newTag instanceof EntryHazardTag ? newTag : {};
 
       this.eventTarget.dispatchEvent(
-        new TagAddedEvent(newTag.tagType, newTag.side, newTag.turnCount, layers, maxLayers),
+        new TagAddedEvent(newTag.tagType, newTag.side, newTag.turnCount, newTag.maxDuration, layers, maxLayers),
       );
     }
 
diff --git a/src/system/arena-data.ts b/src/system/arena-data.ts
index 18620e15223..0d40a9c6234 100644
--- a/src/system/arena-data.ts
+++ b/src/system/arena-data.ts
@@ -47,8 +47,12 @@ export class ArenaData {
     }
 
     this.biome = source.biome;
-    this.weather = source.weather ? new Weather(source.weather.weatherType, source.weather.turnsLeft) : null;
-    this.terrain = source.terrain ? new Terrain(source.terrain.terrainType, source.terrain.turnsLeft) : null;
+    this.weather = source.weather
+      ? new Weather(source.weather.weatherType, source.weather.turnsLeft, source.weather.maxDuration)
+      : null;
+    this.terrain = source.terrain
+      ? new Terrain(source.terrain.terrainType, source.terrain.turnsLeft, source.terrain.maxDuration)
+      : null;
     this.positionalTags = source.positionalTags ?? [];
   }
 }
diff --git a/src/system/game-data.ts b/src/system/game-data.ts
index 8c2a1219245..3ffa7482706 100644
--- a/src/system/game-data.ts
+++ b/src/system/game-data.ts
@@ -1021,6 +1021,7 @@ export class GameData {
             WeatherType.NONE,
             globalScene.arena.weather?.weatherType!,
             globalScene.arena.weather?.turnsLeft!,
+            globalScene.arena.weather?.maxDuration!,
           ),
         ); // TODO: is this bang correct?
 
@@ -1030,6 +1031,7 @@ export class GameData {
             TerrainType.NONE,
             globalScene.arena.terrain?.terrainType!,
             globalScene.arena.terrain?.turnsLeft!,
+            globalScene.arena.terrain?.maxDuration!,
           ),
         ); // TODO: is this bang correct?
 
@@ -1039,12 +1041,14 @@ export class GameData {
         if (globalScene.arena.tags) {
           for (const tag of globalScene.arena.tags) {
             if (tag instanceof EntryHazardTag) {
-              const { tagType, side, turnCount, layers, maxLayers } = tag as EntryHazardTag;
+              const { tagType, side, turnCount, maxDuration, layers, maxLayers } = tag as EntryHazardTag;
               globalScene.arena.eventTarget.dispatchEvent(
-                new TagAddedEvent(tagType, side, turnCount, layers, maxLayers),
+                new TagAddedEvent(tagType, side, turnCount, maxDuration, layers, maxLayers),
               );
             } else {
-              globalScene.arena.eventTarget.dispatchEvent(new TagAddedEvent(tag.tagType, tag.side, tag.turnCount));
+              globalScene.arena.eventTarget.dispatchEvent(
+                new TagAddedEvent(tag.tagType, tag.side, tag.turnCount, tag.maxDuration),
+              );
             }
           }
         }
diff --git a/src/ui/containers/arena-flyout.ts b/src/ui/containers/arena-flyout.ts
index a73846de1ac..ab95d1a3e7a 100644
--- a/src/ui/containers/arena-flyout.ts
+++ b/src/ui/containers/arena-flyout.ts
@@ -317,7 +317,7 @@ export class ArenaFlyout extends Phaser.GameObjects.Container {
         this.fieldEffectInfo.push({
           name,
           effectType: arenaEffectType,
-          maxDuration: tagAddedEvent.duration,
+          maxDuration: tagAddedEvent.maxDuration,
           duration: tagAddedEvent.duration,
           tagType: tagAddedEvent.arenaTagType,
         });
@@ -353,7 +353,7 @@ export class ArenaFlyout extends Phaser.GameObjects.Container {
           ),
           effectType:
             fieldEffectChangedEvent instanceof WeatherChangedEvent ? ArenaEffectType.WEATHER : ArenaEffectType.TERRAIN,
-          maxDuration: fieldEffectChangedEvent.duration,
+          maxDuration: fieldEffectChangedEvent.maxDuration,
           duration: fieldEffectChangedEvent.duration,
         };