Snakes can go a VERY long time without eating (9+ months). Keep an eye on the weight, if you can. You can also find pictures to show you the girth difference between a too skiny, overweight, and healthy snake. For the most part, if the top of the snake isn't triangular shaped, it's still a healthy weight. Ball Pythons are notoriously picky eaters (so I hear), and can go on long fasts (so I've experienced).