Mine will all howl like someone is killing them if they are not fed at no later than 7:20, am or pm. If it is am, they will jump all over me in bed until I get up. They hate it when I don't get home from work until after 9 pm.
Scooter has the most pitiful greeting meow if he is hungry when I get home. It is hilarious.
If my SO is home, he will feed them, then they will lie to me when I get home, and act like they are starving and that he has not fed them.