Typically the length of days between feeding depends on how much perishable produce you use for hydration. Too much apples, oranges,leafy vegetables, squash, etc will attract fruit flies, gnats, mold, and smell. Since most keepers have higher temperatures in our containers, it can get ugly quickly if perishables are left more than 2-3 days. So I try to put enough perishables in the containers that they are eaten by the 3 day mark. Carrots seem to last twice that before needing removal.
CHEERS!
Nick