I'm definitely no expert but I know both of mine do that sometimes. I just offer them food and they eat when they're hungry. But it's usually no more than two days between meals for them and even less likely for my SHTCT male, because he's a little fatty that loves to eat.
It is very common for geckos to not eat if they are stressed, ovulating, shedding, etc...
If you find that they do not want to eat every day IMO every other day would be fine.