Let's say you estimate that it will take 1 man 4 hours to do the job. In theory two can do it in two hours. Four can do it in 1 hr. Eight can do it in 30 minutes.

Regardless, the bill is the same, 4 man hours times the hourly rate.

 

ok thanks that helped me out

 

what does per man hour mean does it mean that you charge them like $50 for every guy you need ...

Yes. A man hour means one man for one hour. A job that will take twenty man hours could be one man for twenty hours or two men for ten hours or four men for five hours or twenty men for one hour. (These examples do not consider efficiencies or inefficiencies of more than one man)