Funny, for many years I fought with my customers over this very issue. They all wanted more time between cuts, I always wanted less. Unfortunately I found they were right, too many cuts in the heat kills the grass. Because rain or not when the temps hit 90 to 100 you have to be very careful how short or how often you cut. There is little argument with a customer when their lawn is dead, they come out and tell you how it is and you're not cutting and that is that. Some Lco's might think that's great for September to "refurbish" the lawn but I can tell you when customers see that kind of thinking it doesn't work out so good. I'd get my money in April, May and June, then I'd sit around most of the summer hoping anything would grow at all. A very few of them would get me to aerate and seed, most were like, you can still cut it and be glad we're letting you. One day it hit me, I raised my cut height to 4 inches. Now I mow lawns as they need it, which is when the grass gets to a healthy height. The only argument I get into today is that I'm not coming out often enough. Works for me, now the money comes steady.