Can I have your schedule??
He should be fine with 2 cups of food a day at his age, as long as you can not see his ribs, he is getting enough food.
As for mid day break... totally up to you. Our boys are left at 7 AM by the boyfriend and I usually get home around 4, but we have a pet sitter come 3x a week for a 45 min play/potty break. They boys do not necessarily NEED it, but I want them to have it