I hear it's based on the time you punch in until the time you punch out. Also calculates the mileage you have driven for the day. If this is true does it hurt my "scratch time" if I punch in early? I like to go through my airs and truck because I am on a awlful route which requires you to do this. I'd rather do it before i leave then on the street. I'm getting paid since I punch in but was curious if it effects my scratch. I am just trying to understand it. Thanks guys.