Adding another table

[gman339]

This may be more suited for another forum, but I'm posting it here because I play FR. I hear a lot of advice and rules of thumb in regards to moving up in limits. The opinions vary, but everyone seems to say you should have somewhere between 15-30 buyins before moving up a level...or something along those lines. What I have never heard, seen, or read is solid advice on what factors should determine when you are ready to add another table to your game at the same level. When do you move from multi-tabling 4 tables to 5, 5 to 6, etc? You may have 20-30 buyins at a level but if you are playing 15 tables at a time, I think everyone would agree your bankroll does not justify it. I would like to get everyone's thoughts on the matter. All advice is appreciated.