diff --git a/apps/gateway/src/preferences/system-override.service.ts b/apps/gateway/src/preferences/system-override.service.ts
index 97a44c9..8edce55 100644
--- a/apps/gateway/src/preferences/system-override.service.ts
+++ b/apps/gateway/src/preferences/system-override.service.ts
@@ -2,7 +2,7 @@ import { Injectable, Logger } from '@nestjs/common';
 import { createQueue, type QueueHandle } from '@mosaic/queue';
 
 const SESSION_SYSTEM_KEY = (sessionId: string) => `mosaic:session:${sessionId}:system`;
-const TTL_SECONDS = 5 * 60; // 5 minutes, renewed on each turn
+const SYSTEM_OVERRIDE_TTL_SECONDS = 604800; // 7 days
 
 @Injectable()
 export class SystemOverrideService {
@@ -14,8 +14,14 @@ export class SystemOverrideService {
   }
 
   async set(sessionId: string, override: string): Promise<void> {
-    await this.handle.redis.setex(SESSION_SYSTEM_KEY(sessionId), TTL_SECONDS, override);
-    this.logger.debug(`Set system override for session ${sessionId} (TTL=${TTL_SECONDS}s)`);
+    await this.handle.redis.setex(
+      SESSION_SYSTEM_KEY(sessionId),
+      SYSTEM_OVERRIDE_TTL_SECONDS,
+      override,
+    );
+    this.logger.debug(
+      `Set system override for session ${sessionId} (TTL=${SYSTEM_OVERRIDE_TTL_SECONDS}s)`,
+    );
   }
 
   async get(sessionId: string): Promise<string | null> {
@@ -23,7 +29,7 @@ export class SystemOverrideService {
   }
 
   async renew(sessionId: string): Promise<void> {
-    await this.handle.redis.expire(SESSION_SYSTEM_KEY(sessionId), TTL_SECONDS);
+    await this.handle.redis.expire(SESSION_SYSTEM_KEY(sessionId), SYSTEM_OVERRIDE_TTL_SECONDS);
   }
 
   async clear(sessionId: string): Promise<void> {