Some of the stations run about twenty minutes on site, most run about thirty minutes, and the real cesspools can run forty five minutes or so. That's my average but I don't get in a hurry. How many can be done in one day depends on three things:
1. What kind of station - some inspections require more time than others.
2. The condition of the stations - pristine stations take less time than those not so well maintained.
3. Travel time.
What that all means is I can't answer your question. I've done as many as fourteen in one day but I don't recommend it.
Also, what are you calling a day? Some people might be thinking six hours, others might be thinking eight. I think from can to can't, as in how early I can get out and on the road and how long I can hold up to the grind.
I try to constantly work ahead of the curve. For example, if I have stations scheduled for a week and deadlined on Friday, I'll try to knock them out by Wednesday. I find I can often report some of them early the following morning with no blow back. Of course the plan doesn't always work but it always better to have a plan of some kind.
I don't burn out, but I do get tired and have to take breaks.
Mary Davis Nowell. Based close to Fort Worth. Shopping Interstate 20 east and west, Interstate 35 north and south.