6:00 OK I'm going to make this spaghetti. I'll put the sauce in the small burner while the water heats up.
6:15 Water's boiling, put the spaghetti in. It will take 11 minutes. The sauce will be nice and hot by then
8:20 Dinnertime
The problem with this is that a Big Part of ADHD is executive function issues, which include wildly underestimating how long it takes *you* to do something. "It'll take me five minutes to do that" except that it take 2-4 hours to get to that 5 minutes.