When I broke mine, I was riding my bike to class (against doc's orders) about a week and a half later. I was riding with one hand, but I was still riding. I didn't start riding road bikes for any kind of distance again until almost a month after the crash.
The doc basically said if it doesn't hurt you can do it. since the collarbone is not a critical bone, that means you can regain a lot of ROM (range of motion) and basic functionality pretty quickly
FWIW, I was 20 at the time, and I healed pretty fast.