Estimating jobs...

Estimate?
As hours increase rate goes down.
Daily drivers my rate is 70/hour.
Max charge for full day depends on interruptions and breaks.
5-6 hours.
Rod rate is 60/hour for every hour spent.
I estimate high and come out low. Usually.

You hit a snag, broken bolt is a perfect example. Its over and above the estimate as its out of your control.
Just did a rocker panel job that i was not expecting to take as long,ended up at 22 hours.
I charged 15. Sure, i gave up a day’s pay but i felt it was still a fair price.