425 degrees for 20 minutes is equal to how long at 350 degrees?

To convert cooking times between different temperatures, a general rule of thumb is to decrease the cooking time by 25% for every 25 degrees you lower the temperature. Cooking at 425 degrees for 20 minutes is equivalent to about 25-30 minutes at 350 degrees, but it’s best to check for doneness as cooking times can vary based on the specific recipe and food being prepared.