I'm doing about 7-8 mows a day (winter excluded), average mow 40 mins. I find this number managable without it killing me. I'm just curious to hear how others structure their day- do you start early and try to smash them all out by lunch time, just work through the whole day like a machine, or something else?
I find I can do about 4-5 lawns before I start feeling it so with that in mind and to avoid the heat of the day I find what works for me is start early, smash out 4 jobs and be back home by 11am or so, take it easy for a few hours then out again mid afternoon to do another 3 or 4.
Another thing I have learned is go slow, especially on those 30C+ days. I used to think I had to work fast, to get the most profit per hour, but that was just burning me out. Slowing down and spending an extra 5-10mins on a job makes the world of difference and also results in a better quality job. It may mean one less mow a day I'm doing but I think it's better than burning out.