I usually keep a close eye on my banana bread for the last 5-10 minutes. As soon as I think it might be ready, I open the oven door and slide a toothpick into the bread or muffin. Just stick a toothpick into the center of your banana bread. If there is wet batter still on the toothpick, it needs more time in the oven. If it comes out clean, your bread is done!