Sorry to ask such a dim question, but I really can't figure it out!
People often ask how long my labour was, but I never know when to count it from - first contractions? 4cm dilated?? 8cm? 
When people say they had 37hr labour etc, are they counting the whole thing from waters breaking, or from the mid wife's official 'start'?
My waters broke on Tuesday morning, admitted to Hospital as 35+5
Contractions started Wednesday night, 10/11pm
3cm dilated at 2/3am
Taken down to labour ward 6am
DS born at 12:24pm Thursday :)
Just searched out my official notes, and they say;
Start of labour 08:40 (Thursday)
Full dilation 11:50
Baby delivered 12:24
Stage I minutes 10
Stage II minutes 34
Stage III minutes 22
Stage I total 190
Stage II total 34
Total time of delivery 246
So was it 4 hours? It was bloody painful for a long time before 8:40am! DS was back-to-back, and I was caning the G&A for a good long time before she said I was officially in labour! 
Please and thank you!