Well, I'm not sure why you would do all that for a 1/4 hour job in the first place. Beyond that why do you even HAVE 1/4 hour jobs. We do not estimate repairs and troubleshooting, it's all T&M. We have a 1 hr. mimimum and we charge an additional dispatch fee on top of the first hour. We waive the fee after 4 hrs. Our hourly rate covers all the stuff you listed as overhead. Can't stay in business any other way.