40 hands/hour/table is my data from the past 10k hands I've played.

As for the 30 min, I meant that as the minimum break between sessions. I always do extra review after im done playing for the day, and before i start. Although to be honest, i definitely am not doing 50/50 play/study. probably more like ~2hr/day. which maybe i should start doing more of, but this is my starting point.

as far as 3-4 tables, I feel that I can do this giving it my full attention, and I worry that if I drop to 2 tables, I'll start getting bored and spending more time browsing facebook or some such nonsense. so I guess I'm trying to maximize my concentration.

the 2.5 hr goal is based of of my session data. Usually it was around the 1k hand point where my greenline started dropping in each session.