Time spent driving to a client's location or worksite is work time and you should be paid for it: therefore, as a non-exempt (we presume) hourly employee, you should be paid for the 40-45 minute drive (each way) as well as for any time actually spent waiting for the client until you find out about or confirm that they cancelled or are a non-show.If this happens often enough to have an impact on earnings, you may wish to contact your state's department of labor about filing a complaint.There is no right to mileage reimbursement: an employer might voluntarily choose to pay you for mileage, but does not have to.