By week six an auto that took a litre every three days suddenly wants that much daily, and growers still on the seedling schedule end up with drooping plants and shed lower leaves. Lifting the pot is a more reliable cue than a calendar, since the shift happens over just a few days. The water use curve charted on https://turboautoflowerseeds.com from logged grows shows the jump clearly and lines up with the end of the stretch. Underwatering at this stage costs more yield than the early overwatering everyone worries about.