With my first they had to ripen my cervix with cervidil pills so I went in the night before. They started pitocin around 7:30 so ill start from there. It was 7 hours.
With my second it was around 6 hours.
Had the pill thing inserted at 10 pm. Next day they started pitocin around 10 am. Stopped it around 2. She was born at 8:30 pm that night. So I say 10 hours with only 6 hours of active labor.