All of my labours have been super short and spontaneous...

dd1 from first contraction to baby 1hour 50minutes
dd2 " " " " " 50 minutes
dd3 (six year gap and told it would be longer) was two hours from first contraction, because this time I laid down and used to slow down the labour!

Apparently I dilate without any contractions and then whe I go into labour it's a few contractions and then transition! (the after pains are pretty horrific though)