Sorry about your crash; perhaps I can shed some light on getting back to riding. In August 03 my husband fell off a ladder and broke BOTH wrists. One was just a hairline that only required a splint, but the other required surgery and pins. He got the cast off after 5 weeks (after annoying the Dr. not to wait 6) and got on the bike the next day. He was in horrible pain and could only do ten miles, but he increased it slowly for a couple of weeks, along with going to OT and home exercises. I would say after 2 months he felt totally normal. By then it was getting cold out, so when he started riding again in March there were no problems. He was religious about doing the exercises and probably would not have listened if the doc had said to stay off of the bike (he didn't).
Hope your recovery goes well.

Robyn