How long can you soak in your bath tub without having problems later?

Is it good to soak in foam or aromatherapy oil?How long can you soak in your bath tub without having problems later?
Most Internet sites and health books when addressing UTI's seem to agree that you should not stay in there longer than 30 minutes and be very careful with foam and oils pick only things that were created to be soaked in and even then be choosy- even if it doesn't cause a UTI some things could cause an alergic reaction to your whole body. But maybe you can burn a candle up on the counter in the bathroom with a relaxing scent or get lavander lotion to put on after. At the supermarket and Drug stores they have these little pods that you can use when you take a shower and as the water pounds down they disinagrate and fill the air with a smell...I tried orange it was very spa like. Enjoy your bath safely!!! :)How long can you soak in your bath tub without having problems later?
problems???well I don't know....but for how long can you stay in a bath tab??an hour or two?don't you get bored?whatever, just don't stay for too long and watch out with oil because a friend of mine used it and she didn't know she was allergic!!
You can soak in the tub but I would not recommend doing it every day as that can give you urinary tract infections.