Started having mild contractions about 1am Thurs morning, these stayed mild but constant until they tailed off about 9am. Started again about 6pm that evening and was in 'established labour' by about 1am Fri morning. By 11.30am was fully dilated but knackered and sleepy, with no urge to push, and I think I recall the midwife saying ds's heartbeat had begun to drop and also "This baby's getting tired now, I think we need to break your waters to get things moving again."
Which she did, and after about 15 minutes of pushing DS was born at 12.14pm.
So all in all, from first contraction (proper time round) to birth, about 18 hours.
DS2, waters had to be broken artificially again when I was 6cm as his hearbeat was slowing down, from then on it was about another half an hour till I was fully dilated and pushing - he was out in about 5 minutes!
Labour was about 12 hours that time round.