We let Regan play in the tub for a while. Sometimes this is the only time I can get laundry done lol. Our laundry room is located across from her bathroom so I can hear her playing, and if she gets quiet I can just look out the door and see her. Sometimes I leave her to go do something for Eden as well. I try to stay with in hearing distance though. SHe is a noisy kid in the tub haha. Always talking, splashing, pouring, etc. I don't ever leave her alone (where I can't see or hear her at all) for more than a couple of minutes though.