I average about every other day, just mysis and nori if I'm not having any particular algae issues (if I am having an algae problem that my tang (might?) eat, I'll withhold nori to encourage eating the problem algae.
Mysis feeding spread out over about 30 min, a lot of it target fed to my RBTA's, fish get the leftovers. When I do feed, it's usually a pretty big chunk of mysis, at least 2-3 pop drops worth (PE brand only!).