I generally don't put Frankie in for very long, but mainly because I have only just started using it and Ky thinks he has to push her in it like a swing! OMG
-But she does seem to really enjoy it and it frees your hands up a little while, say while you are preparing dinner etc....but I wouldn't feel comfortable leaving her in it if I couldn't see her, so if your in the bath, you may want her on the bathroom door.