I've played up to 8 tables at the same time but from my own experience I can say that if you want good results, do not play more than 2 tables, it's crazy and a waste to play so many tables if in the end you're not going to win a single tournament, I've tried 6-5-4-3 tables at the same time but you never get good results ... If you really want to win just play 2 tables, it's my advice