The point of hand watering is to spend time next to every plant.
With my style I give the plants all the same water. It has worked for years. As long as the sizes stay similar it works just fine.
Water twice per week, and that's it.
In the pictures of the flower room that were posted there will be roughly 960 plants.
With a mirrored side soon to be built.
So roughly 2000 flowering plants, plus veg plants and clones. So the numbers get real big real fast.
Honestly after a nights sleep I am thinking the only way to do this efficiently is to setup automatic watering for 1 day a week, and then hand water the other day.
P.S. The guys are not watering the plants the same at all. Not even close. The error always comes from humans.
good help is hard to find
good luck