I think I have it dialed pretty good for what I'm doing. When I do a quantity run I can easily pull over a pound with just a cheap 600 watt HPS in a 4 x 4 tent. It's pretty much hands of as well. A reservoir, cheap complete nutrients, blumats, fabric pots, coco. Sometimes I don't even look at the plants for days. Watering is just making sure the reservoir is filled. Other than that, once everything is set I just wait for the plants to be done. I don't spend much time looking at my plants except for every couple of days for maybe 10 minutes looking closely to see if there are any signs of bugs. I don't trim any leaves so no time spent there. Occasionally I do need to stake up some of the plants if the cola's get too heavy and start falling over.
So basically once all the plants are in and blumats setup it runs just like a machine. A timer controls the light and blumats water the plants. I never have nutrient issues so I'm never running around from this issue to the next like many. I go simple and it works. I don't have anything to do until harvest which I detest. I hate trimming weed.