If you went into labor naturally... and you say, for example, I was in labor for 24 hours, obviously the clock stops when the baby is born, but when do you consider the clock to start?

When you felt mild contractions? When you realized this was the real deal? When contractions got painful? When your water broke? etc?

I had a pretty quick labor, but DH always tells people my labor was super short. I didn't wake him up until the contractions got pretty bad, so whenever he tells people that I always respond with "Ha! whatever, he slept through the whole first half!"