Very interesting responses!
I was my mothers "first" of 4 babies and came 7 weeks early after her water broke. I am not sure how long her labour with me was though.
For my "first", I went into (early) labour on my due date, lots of early labour discomfort followed by 6 hours active labour and 2 hours pushing. My water didn't break on its own, my OB actually broke it about 10-15mins (I think?) before my son crowned.