SNG level equivalent to 3-6 limit?

I did a search and didn't really come up with much definitive....

Basically, I'm getting bored with playing limit. I'd like to break the routine and play SNG's for a while. The question is, what level of SNG's is comparable to playing 3/6 6-max limit? I make about 3BB/100 at limit. So, call it about $25 and hour.

If I have 30% ROI on a SNG (something I saw from a FAQ here), and each takes an hour, .3 * X = 25 ~= $80 SNGs! Seems like a tremendously large SNG, way past my comfort zone.

So, do people play 2 smaller SNGs at the same time typically? I usually play two 3/6 tables, so that'd be in my comfort zone as far as multi-tabling.