9 hours from start to finish with DD1 (first niggle and waters breaking to DD being born). Active labour was recorded as 6ish hrs though.

DD2 was 3.5 hrs (roughly) from my waters breaking to her arrival. Active labour was only 37 minutes though 47 on my watch. She was fast, crazy fast.

Both girls were SROM at home. With DD1, I had steady contractions immediately but DD2's contractions didn't start until about 50 minutes before she was born.