Dumb labor question

Adelheid

Ok so I’ve had three babies and am pregnant with number four. Still, I have this one question I never quite figured out. What counts as labor? I read about women who are in labor for 30hrs and others that do it in less than one. So.... at what point does labor start? Contractions 2 min apart? When you are in the hospital waiting around? Or when you are actually pushing? Thanks. ♥️