How long will it take to bake a dish at 250 instead of 275?

Baking requires precise temperatures due to chemical reactions taking place. Changing the heat by 25 degrees Fahrenheit will significantly affect the food's cooking time. While it's not advisable to use 250 instead of 275, if necessary, you would have to add more time. But the exact adjustment time can't be provided without understanding the food being baked. Factors such as type of food, size, consistency, and oven specifics influence the baking time. If you wish to substitute the temperature due to your oven calibration or recipe specifications, consult a baking resource to achieve desired results.