I always went once a day at first and then moved up from there. I always filled the trays with at least 2" of crouton rockwool and covered with panda film. So I was using a large volume of media. Only usually need 2 irrigations a day unless I really packed in clones sog style 4 per sq ft. Rockwool benefits from a bit if a dry period, although not too far because of its alkaline nature. I have gone 1 feeding every other day before because i felt it was just to wet especially when cooler temps but the ph can rise too far in the blocks if not careful. Not sure if this helps or not.
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