How long until i get 1 bitcoin?

So i have one Asicminer usb block erupter, im about to get two but my question is how long will i take with two usb block erupters until ive made 1 full bitcoin and can cash that into around 200 bucks (USD)?

336MH/s is about $0.10 a day. 

Thats without electricity costs too so keep that in mind.... And for your answer, probably years? I think