If you religiously canvassed those hours and took into account the fact that some days you will hit an already saturated area and get none. Some days you will chance upon a decent area and get lots and every other variable in between.
In my experience I would expect to average 3-4 yeses, 2-3 I'll have to speak to my husbands, 15 my husband cleans them ( he doesn't ) and 50 ish we already have a window cleaner.
But someone else will probably tell you differently because there are too many variables to really give you an answer