Whatever they are charging, they are certainly earning their money in this weather. Hot as blazes or rain which means no working and no getting paid. When I see roofers working this time of year, they have my upmost respect. When my neighbor had his replaced not long ago, I had no issue with them starting at sunrise and knocking off at lunchtime. I didn't mind giving up a little sleep for them.
I did it for a while when I was a young man and I have to agree with you on this one. There is no way in HAIL that I could do it now. I'd have a heart attack and stroke simultaneously before I got the old roof tore off.