CBD Critical Mass

Depends on how much volume you oush in the 4.5 minutes - either try reducing your hours interval or increasing duration if you are worried about under watering. I would say probably 500-750ml per 24hrs where you are now as an estimate. I would water to saturation and tiniest runoff manually, then weigh pots, set 24 hours timer, weigh pot, and keepnweigh every 24 hours to see how long it takes that much liquid to dry then set the system from there.