For years my retired neighbors, who annoy the shit out of me with typical boomer HOA type shit, have varied the day of the week they mow. Sometimes even from week to week. They finally settled into a rhythm and each mow on the same day of the week each week. Riding around on my mower bored out of my mind I finally figured it out. They were trying to get the most days where their own lawn looked nicest. The equilibrium gives everyone 2 days. So I start thinking, I could switch days and it would ruin the whole balance. How petty can I be you ask? How bored do I get mowing you ask? 11 is pairwise coprime to 7, the interval they mow on. The least common multiple is 77. So around 2.5 months before I land back in their weekly mow rotation. Within the bounds of not mowing more often but also not letting it get so tall it becomes a big pain in the ass, I'm pretty sure 11 days is the maximally annoying interval.