I don't care what you have to say on this matter mate...its clearly BS...I've been window cleaning for 31 years(17 on ladders).
The only way a window cleaner could clean 86 houses in a day would be if they worked 10 hours that day and just posted a slip through half of them without touching the windows!
It's 100% the truth, if it takes you 2 and a half minutes to squeegee the window then maybe your just slow at window cleaning