It depends on my schedule... some days I eat 3 big meals, some days small snacks in between, some days it's 6ish mini meals. Some days I'm eating a bite here or there because I've got a long experiment all day long that leaves me no more than 2 minutes at a time to eat.

I do try not to go more than 5 hours without eating anything, or else I might start to feel yucky.
I guess on an average day, I eat 3 main meals, with 3 smaller snacks (B, S, L, S, D, S).