Man, sorry about that! I broke the fourth metacarpal on my right hand October of last year in a football game, in fact it looked very similar to your break. The X-Rays actually displayed it as being twisted like a pretzel...
I thought I jammed my finger so I went to pull it out and thats when the pain came a rushing... I heard it snap when I did it and it swelled up like a golf ball.
6-8 Weeks is very accurate... make sure you go through the physical therapy, at times it will be extremly painful, but you want as much movement as you can from your fingers. It is true when they say no pain, no gain.
Unfourtunately for me some calcium built up by my knuckle which makes it larger than the knuckle on the other hand, so Im waiting till the new system to get a new one...