Bake the bread until the sides of the bread are crisp and a skewer inserted in the centre comes out clean. Since sometimes baking in the air fryer can cause too much browning on top I prefer placing an aluminium foil on top towards the final 10 mins of baking to stop it from browning too much. Another point to note is that if your bananas are very ripe then due to excess moisture it might take another additional 1 to 2 mins for you to bake the bread than what the recipe calls for.