An employer can certainly measure time in days, and sometimes demand/expect people to put in extra hours in order to make a deadline. But working extra hours d

An employer can certainly measure time in days, and sometimes demand/expect people to put in extra hours in order to make a deadline. But working extra hours doesn't make one more productive than average and no employer should measure productivity that way. If person A works 80 hours per week and gets as much done as person B that works 40 hours per week no employer will claim that A is as productive as B. On a side note, given that I do contract work currently you can be certain that both me and my employer measure time in hours not days.