10 hours' labour for me. Got in hospital at 7 am (I was scheduled for a planned c section) but I was already 4 cm dilated (without any heavy contractions, just some discomfort). They basically asked me if I wanted to 'see how it goes' and let labour progress naturally, so I laboured for 10 hours more or less.
I still ended up with an emergency c sec as I got to 10 cm and pushed for 1.5 hours and baby was not descending at all. He was never in distress, and the hospital really let me get on with it, but in the end my 'urge to push' died down and baby's head was just not descending. I don't know why. He didn't want to come out maybe!
I don't think that our hospital had a 'time limit' as such, it was more of a case that they let you get on with it if everything is OK. If there are any complications, then they would be more 'ready' for a c sec.
I couldn't have a bath/water birth because of previous c sec, but I don't know if it's the same in all hospitals.
I was considered high risk and monitored a lot of the time but it didn't bother me.
And I feel very good about having tried - people say to me 'what a shame' but I don't mind at all. It was a very positive labour and a very positive birth.