With the rain we're getting (about 3 days a week and have been for the entire spring and summer) and the milder summer temps the grass is really growing fast and is super thick. I'm cutting about every 4 days to keep the yard from getting into a real mess.
My grass never need to be cut. I cut it every time i do Any thing to my mowers. Change blades/ oil/ filters. Or if I see one piece stand higher than the others. So close to every three days
IMO I well kept lawn never looks like it needs to be cut.
As seldom as possible, but when it looks shaggy it gets mowed. Sometimes I can go 10 days or so, sometimes twice a week. I know alot of people like lawns, so I'll try to not offend anybody that does.