I broke a clavicle 3 years ago. Took about 6 months to get back to activities - 6 weeks for the bone to mend, 4 months of physical therapy to get range of motion back. During the PT, I was spending 2-3 hours per day on range-of-motion exercises, so not much time left for aerobic activity anyway. Even walking was uncomfortable for the first few months, and hiking bothered me for over a year afterwards - still does sometimes. Biking is less of a problem (no jarring).