Higha!

In my opinion this is not that easy to answer, it depends on different factors, type of soil, climate in box/room/outdoors, age and height of plant, even the plants have different phases of "digesting" water. What i do, carefully watching and feeling the soil daily, watering again when the surface of the soil got dry and a bit deeper slightly wet. I have pots with 5 gallons, plants about 90 inch and average watering is about 3 liters every second day .

Peace, Martin