J.C.
Congratulations on your twins!
As for my experiences with my two children, I nursed both of them so they ate QUITE OFTEN, however, I have heard formula fed babies go longer in between feedings. They will definitely eat less during the night when they begin cereals, etc., because they will have some bulk in their tummies especially if given right before bedtime.
If I remember correctly, I believe mine started eating less often during the night at about 2 or 3 months old. I ended up being one of those mommies who let them sleep in bed with me; that definitely helps them sleep throughout the night.