1 and 2- less than 4 hours, start to finish. Was at the hospital for about an hour of each, so there was minimal time for poking, prodding, and interference (though there was still way too much of that imo). They did break my water with ds, despite my protests (wtf? is there even a good reason for that?). They didn't believe me with #2 when I told them he was coming within an hour. I got eyerolls and comments about how I would likely be there all day. I can't imagine having a hospital birth again if I ever do have another. Fast as it was, it still sucked to have so many people around gawking, poking, and prodding. Also I was never told about other positions at all. Yes I was young, fairly ignorant about birth choices, and lucky things went so smoothly.
ETA- oh yeah and I also remember being told to 'Be quiet!' Was not happy about that at all.