When did your labor officially start?

Clare • so much love already for my little baby bean 💜 born 3/26, Violet Aimee 💜
How can you figure out how many hours you were in labor? When do you start counting? From the first painful contraction? From when your water broke? From when you dilated to a certain point? From when your contractions were ___minutes apart?
Just wondering cuz people are asking me how long I was in labor and idk what to tell them lol.