I was told from 'regular' contractions, DD1 was 9hrs and DD2 was i think 5hrs.
Someone said to count from waters breaking but for me that would be DD1 20mins and DD2 8mins..
No more for me, DP would need to be armed with a catchers mit and some towels
Checked my notes from DD1 and they have it listed as 9hrs 30min.
1st stage being 8:55
2nd 0:25
3rd 0:10

I didn't find out with either of the girls how dialated i was so i guess i can't go by that either?