Well, it depends on the result you’re aiming for. If you simply want a blonde base, let the bleach stay on your wet hair for 15 minutes. But if you’re aiming for a lighter color than your current hair shade, leave the bleach for about 30 minutes. Remember that leaving the bleach on your tresses for too long increases the risk of severe hair damage. So always stick with the recommended time. It’s better to be safe than sorry!