I do my boys cages every night around the same time, between 10 & midnight. Depending on who is who, i give them all about 2 - 3 tablespoons. i dont measure it, i just know that the bottom of their bowl gets covered. i also give them a huge handful of hay every night. some get 2 big handfulls and others maybe a half. after a while you figure it all out and waste less. also if you dont give enough at the initial feeding, you could always add more. i do change my food & hay every night though, i dont let it sit for more than 1 day because once a poop drops in, they are done.