i don't understand what you mean by "intervals"? i bind all day, i usually don't bind at night - it's not particularly good for you, and when i do i always have a massive coughing fit in the morning, plus it messes my back up.
I'm very small chested so I only bind when going out in public, most of my shirts aren't tight anyways so I don't really need to. Probably a few times a week for a couple hours at most.
I bind when I'm in public, unless I'm wearing a shirt baggy enough so I don't have to. Don't bind when at I'm home usually, unless I'm expecting company.