TBH it varies because mine is a mixed reef tank. I feed 2X a day mainly due to the fish.
Some LPS and large polyp gorgonians tho are fed by hand weekly at least and the SPS get all they need from the light source & the nutrients in the water. This way the water remains clean, no algae issues etc. Some food escapes into the DT while feeding the fish so i leave all but 1 pump off until i see nothing left, then i turn on the filter, skimmer, and other pumps back on. More fun then work even in the am.