I use the Hydor Koralia Smartwave timer it works well and for years I had it set to switch every three hours but recently I changed up things and changed the cycle to every hour and so far I am enjoying the new setting.
Remember the ocean is continually swirling so it’s just not the tidal effect that we try to recreate but ocean swirls as well.
Some reefers switch their flows as often as every thirty seconds while others may not switch for hours. Basically the choice is a personal one.
There is in my opinion no wrong answer as to how often to switch flows
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 My aquarium is nothing but a smorgasbord for my cats.....
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