How long was my labor??

When does ‘labor’ technically start? Or when saying you were in labor for (x) hours, do you count or from the time your water breaks or?

*especially those induced*

My son is three so it’s been a minute but I’ve always wondered!

They put cervidil in me on 7/11 at night. Contractions started in the middle of the night. Doctor didn’t break my water until around 8:30 am on 7/12. I had my son at 7:33pm but I technically only pushed for an hour! So when would I consider the start of labor?