I feed once a week. The odd time I'll miss the once a week day, but then I feed 3 days after. So generally, every 7-10 days. If I know I'm going to miss a feeding day due to money, I just skip that week. My snakes will eventually be breeders, but once I expand my collection more I'm going to get a little more "strict" or "advanced" with feeding.
Dont know why I chose those words. They just came to mind.