Update app.py

app.py

@@ -20,7 +20,7 @@ with open("default_scenario.json", "r", encoding="utf-8") as f:
     DEFAULT_SCENARIO = json.load(f)
 
 TICK_RATE = float(os.getenv("TICK_RATE", "2.0"))  # seconds per tick
-MARKET_LENGTH = int(os.getenv("MARKET_LENGTH", "600"))  # default timeline length
+MARKET_LENGTH = int(os.getenv("MARKET_LENGTH", "1900"))  # default timeline length
 MIN_MARKET_LENGTH = int(os.getenv("MIN_MARKET_LENGTH", "600"))  # hard minimum
 START_PRICE = float(os.getenv("START_PRICE", "100.0"))
 DEFAULT_VOLATILITY = float(os.getenv("DEFAULT_VOLATILITY", "0.8"))