I determine feeding schedule by the snake. If all my snakes feed consistently on a 7 day schedule then that's what they get. Of some don't feed consistently on 7 days then you can move them to 10 days and so on. I have 4 snakes, 3 eat every 7 days since they are still young only about a year old and my last which is 7yrs old eats whenever he wants. So he actually doesn't have a schedule at all. He just doesn't eat very much so to cut down on wasted feeders I don't have him on a schedule. But just try and find a balance that works/is easy for you and is best for your snakes as a whole/individually.