This is, essentially, what I, too, do. I don't think that, decades ago, there was any other way than trial and error to arrive at something like this. Just what seems to work.
It's been long known that half starving small animals can increase their lives by relatively large fractions, but, in humans what happens is the brain requires the protein from the muscles. First go the muscles, then the brain, itself. World war 2 results of prisoners in Germany.
The last time I asked my doctor about it, about four years ago, the day he had a young substitute doctor, the substitute told me that, really, nobody, still, knows what to eat, when. The obvious restrictions depend on a person's health in general and specific. In fact, some persons do good on diets that lead to higher blood-sugar levels, and, so on. As for eating over the course of an hour, what comes to my mind, from the last time I read about it, there is a second shot of insulin, after about forty minutes, which can be quite harmful (to the body) on its own. So, eat, well within the forty minutes, or continue eating, well past the hour.