Im not sure on percantage off top of my head but my BRM guidelines is as followimg
Cash: I need atleast 20x the max-buy im for that stake. Even this I usually want moremthat is just my min.
SnG/DoNs: I need atleast 40x buy-in.
MTT:100x buy-in, but will occasionaly take a shot at a higher but not reguraly. E.g. I play 1.10 MTT but occasionally take a stab at 2.20 ones once a week usually if I am positive that week (cause tournament I play is on Sunday.)
Think he may just ask
how many games to buy at same time frame.
even with 40 Buyin for Sit N go.
think still able to multi- tabling.
therefore it comes to be how much money from bankroll is safe to put into the current gaming tables.
think the worst case ever is , 40 buyin for sit n go, and open 40 tables and got a sudden network stop for two hours something...