How long does it take for the average wimpy guy to build muscles?

[ryanman]

If your skinny you should be noticing muscle definition at a very early stage. If your a fatty it naturally takes longer as you have to get rid of the fat first

If however you happen to be as great as i am after 1 workout session you should look and feel like geoff capes

Yep, Geoff Capes, well known to be a fine figure of a man.