Depends on what food you are feeding. In general, you can feed with the same frequency that’s already working well for you.
To see how long to run it for each cycle, run it for a minute (or however long), see how much food it puts out, and compare that with how much you want it to feed.
I leave the recirc pump on 24/7 as recommended. I just turn the flow on the recirc down to the minimum for food that takes longer to rehydrate like freeze dried mysis. That way it hydrates faster than just sitting there, but doesn’t come out before it’s rehydrated like it would on high flow.