This is all relative. If you let a plant vege for 4 moths into a 5 gallon pot and then don't transfer ut to a bigger out and put it into flower. You'll probably water twice a day. If you tranfert a month old seedling into a 5 gallon pot you'll probly water once every 10 days.. So it is tottally possible to have to water a plabt every day..That’s nonsense. You don’t have to water a 20L pot once a day. I am in a 5 gallon pot of coco with 30% perlite and water once a week. Watering once a day is not needed, you are over doing it.