It has nothing to do with the hours . You are bidding a job . 2 people bid the exact same job . to make it easy the customer has the stone on site , so all you are bidding is spreading stone . Bobs landscape bids $500 Grants landscape bids $70 an hour . Who is the customer gonna hire ? ........... Bobs landscape . Why ? Its a fixed cost , Grants landscape may take 2 hours or all day who knows how fast they can work.