Playing more then one SNG at a time

[yid3655]

I would guess this topic has been covered before, but what is the general opinion on the maximum amount of SNG's you can play at one time to turn over a decent profit. Obviously the quality of the player makes a big difference but just a general average?

I have played 1, 2, 3 and 4 at a time

My biggest success is probably with 2 tables, tend to always be kept interested and also allows you to monitor individual players (playing 3/4 very hard)