Have been known to inflate the bill. The parts are also high and they pay way less than the origional purchase price. A lot of the items come from Communist China or some other banana republic. The charge starts immediatedly the time auctually spent may differ from the charge. You may come out better buying your part somewhere else unless it is an emergency.
If you work there you had better watch your time card real careful, espessialy overtime. They try to get you wherever they can. Take pictures of the injured part and pictures thereafter and demand the replaced part back. (It is your part). If you dont make the demand up front, then you may have nothing coming. Some of the replaced parts are still may be of some core value.