Are you saying that you play 12 tables at one time?!?! If so, that's pretty damn impressive... especially if you're able to make a profit doing it! My current effective max is 4 tables at a time, but I am playing mostly Omaha Hi-Lo SnG's. The other day I mistakingly registered in 5 tournaments. It ended up being ok because 2 of them were Holdem, but if all 5 had been O8, I think I would have struggled. Not sure how many Holdem tables I could handle at a time, but since I play about 75% O8, I've never tried to max out on HE. Certainly it's a lot more straight forward and you can therefore manage more at the same time without a major risk of missing something... but, I still doubt I could manage more than 6-7 HE tables simultaneously.