It seems some women count from the first twinges. It seems like doctors only count it from when labour is 'established'. I have read that you start counting labour from having regular painful contractions 5 mins apart or something like that. I had a funny labour though as the contractions were all over the place. I never had regular contractions for more than about 20 mins, even when I was pushing they were not regular. From the first contractions that were like very strong and slightly painful BH I count 38 hours but counting from when there was no doupt at all that it was labour I'd say more like 32 hours. The midwife started by saying that the contractions were not regular enough to count but then she counted 27 hours offically which is from before I even saw her, I'm not sure where she got that number from, I think she just kind of picked one because she realised I was getting strong contractions for a long time they just never got regular. I think that is probably a fair guess as I'm not sure when to start counting myself but if I ccounted from when it started getting hard to speek through contractions it was about 29 hours.