This math is infuriating. Do you actually bill for every waking hour of your day? If not, this calculation is nonsense. My hourly rate is similar, but I only work 8 hours per day. I have plenty of time after work to do things like spend 7 minutes returning a cheap item. I have absolutely no desire to work 16 hour days even if I was paid overtime, so it's totally disingenuous to pretend that my time after work is worth the same exact rate as my "hourly" rate at work. (I'm actually salaried so if I did want to work more it would just decrease my hourly rate.)