diff --git a/src/core/configuration/Config.ts b/src/core/configuration/Config.ts
index ac1d9ee4ab..d3f9d6eea1 100644
--- a/src/core/configuration/Config.ts
+++ b/src/core/configuration/Config.ts
@@ -2,6 +2,7 @@ import { Colord } from "colord";
 import { JWK } from "jose";
 import {
   Game,
+  GameType,
   Gold,
   Player,
   PlayerInfo,
@@ -27,6 +28,8 @@ export interface ServerConfig {
   turnstileSiteKey(): string;
   turnstileSecretKey(): string;
   turnIntervalMs(): number;
+  spawnPhaseTicks(gameType: GameType): number;
+  spawnPhaseSeconds(gameType: GameType): number;
   gameCreationRate(): number;
   numWorkers(): number;
   workerIndex(gameID: GameID): number;
diff --git a/src/core/configuration/DefaultConfig.ts b/src/core/configuration/DefaultConfig.ts
index 6ad7efb27e..2d13d8d601 100644
--- a/src/core/configuration/DefaultConfig.ts
+++ b/src/core/configuration/DefaultConfig.ts
@@ -117,6 +117,15 @@ export abstract class DefaultServerConfig implements ServerConfig {
   turnIntervalMs(): number {
     return 100;
   }
+  ticksPerSecond(): number {
+    return 1000 / this.turnIntervalMs();
+  }
+  spawnPhaseTicks(gameType: GameType): number {
+    return gameType === GameType.Singleplayer ? 100 : 300;
+  }
+  spawnPhaseSeconds(gameType: GameType): number {
+    return this.spawnPhaseTicks(gameType) / this.ticksPerSecond();
+  }
   gameCreationRate(): number {
     return 60 * 1000;
   }
@@ -542,7 +551,7 @@ export class DefaultConfig implements Config {
     return 3;
   }
   numSpawnPhaseTurns(): number {
-    return this._gameConfig.gameType === GameType.Singleplayer ? 100 : 300;
+    return this._serverConfig.spawnPhaseTicks(this._gameConfig.gameType);
   }
   numBots(): number {
     return this.bots();
diff --git a/src/server/GamePreviewBuilder.ts b/src/server/GamePreviewBuilder.ts
index ea99160258..5752c3207b 100644
--- a/src/server/GamePreviewBuilder.ts
+++ b/src/server/GamePreviewBuilder.ts
@@ -1,6 +1,7 @@
 import { z } from "zod";
+import { ServerConfig } from "../core/configuration/Config";
+import { GameMode, GameType } from "../core/game/Game";
 import { GameInfo } from "../core/Schemas";
-import { GameMode } from "../core/game/Game";
 
 export const PlayerInfoSchema = z.object({
   clientID: z.string().optional(),
@@ -132,6 +133,7 @@ export function buildPreview(
   workerPath: string,
   lobby: GameInfo | null,
   publicInfo: ExternalGameInfo | null,
+  serverConfig: ServerConfig,
 ): PreviewMeta {
   const isFinished = !!publicInfo?.info?.end;
   const isPrivate = lobby?.gameConfig?.gameType === "Private";
@@ -178,6 +180,19 @@ export function buildPreview(
 
   const winner = parseWinner(publicInfo?.info?.winner, players);
   const duration = publicInfo?.info?.duration;
+  const gameType = lobby?.gameConfig?.gameType ?? config.gameType;
+  const adjustedDuration =
+    typeof duration === "number"
+      ? Math.max(
+          0,
+          duration -
+            serverConfig.spawnPhaseSeconds(
+              gameType === GameType.Singleplayer
+                ? GameType.Singleplayer
+                : GameType.Public,
+            ),
+        )
+      : undefined;
 
   // Normalize map name to match filesystem (lowercase, no spaces or special chars)
   const normalizedMap = map ? map.toLowerCase().replace(/[\s.()]+/g, "") : null;
@@ -187,7 +202,6 @@ export function buildPreview(
     : null;
   const image = mapThumbnail ?? `${origin}/images/GameplayScreenshot.png`;
 
-  const gameType = lobby?.gameConfig?.gameType ?? config.gameType;
   const gameTypeLabel = gameType ? ` (${gameType})` : "";
 
   const title = isFinished
@@ -210,7 +224,9 @@ export function buildPreview(
     const detailParts: string[] = [];
     const playerCountLabel = `${activePlayers} ${activePlayers === 1 ? "player" : "players"}`;
     detailParts.push(playerCountLabel);
-    if (duration !== undefined) detailParts.push(`${formatDuration(duration)}`);
+    if (adjustedDuration !== undefined) {
+      detailParts.push(`${formatDuration(adjustedDuration)}`);
+    }
     if (matchTimestamp !== undefined) {
       const dateTime = formatDateTimeParts(matchTimestamp);
       detailParts.push(`${dateTime.date}`);
diff --git a/src/server/GamePreviewRoute.ts b/src/server/GamePreviewRoute.ts
index 01837ff19b..acd95c26aa 100644
--- a/src/server/GamePreviewRoute.ts
+++ b/src/server/GamePreviewRoute.ts
@@ -102,6 +102,7 @@ export function registerGamePreviewRoute(opts: {
         config.workerPath(gameID),
         lobby,
         publicInfo,
+        config,
       );
 
       // Always serve HTML with meta tags for /game/:id route
diff --git a/tests/util/TestServerConfig.ts b/tests/util/TestServerConfig.ts
index 94b6259430..f4c2690b28 100644
--- a/tests/util/TestServerConfig.ts
+++ b/tests/util/TestServerConfig.ts
@@ -1,6 +1,6 @@
 import { JWK } from "jose";
 import { GameEnv, ServerConfig } from "../../src/core/configuration/Config";
-import { PublicGameModifiers } from "../../src/core/game/Game";
+import { GameType, PublicGameModifiers } from "../../src/core/game/Game";
 import { GameID } from "../../src/core/Schemas";
 
 export class TestServerConfig implements ServerConfig {
@@ -44,7 +44,13 @@ export class TestServerConfig implements ServerConfig {
     throw new Error("Method not implemented.");
   }
   turnIntervalMs(): number {
-    throw new Error("Method not implemented.");
+    return 100;
+  }
+  spawnPhaseTicks(gameType: GameType): number {
+    return gameType === GameType.Singleplayer ? 100 : 300;
+  }
+  spawnPhaseSeconds(gameType: GameType): number {
+    return this.spawnPhaseTicks(gameType) / (1000 / this.turnIntervalMs());
   }
   gameCreationRate(): number {
     throw new Error("Method not implemented.");