I like to feed mine 2x a day, but I'm running short of mysis, and waiting for the child support check gets boring. PLUS I'm having a phytoplankton bloom in my tank, so I'm feeding 1x a day.
but, they are usually more interested in food if i feed 1x a day. they spend the rest hunting.
the amount of time spent daily on a horse tank=at LEAST 20 minutes, plus one day a week spending an hour or two doing various things like scrubbing glass, a water change, good maintnence on the rocks, stuff like that.