What would happen if you left the muffins in the oven for one hour?

If you left the muffins in the oven for one hour, they would likely become overcooked and dry, resulting in a tough texture. The tops might burn, and the bottoms could become hard or even charred. Additionally, the muffins may lose their appealing flavor, developing a bitter taste due to prolonged baking. Overall, they would be far from the desired fluffy and moist consistency.