I did my first 5k 3.5 months post-op. I have my first criterium next Friday (4.5 months post-op). I have my first duathlon a week after that. The following week I'm doing a race similar to Warrior Dash on my 5 month anniversary. Before my 10 months post-op, I hope to have completed 9-10 races (mixture of running, triathlon, duathlon, and cycling).
As long as you give yourself time to heal and recover BEFORE you start training, 10 months post-op shouldn't be an issue. I didn't fully give myself the "before training time" as just recovery and got so angry at myself for not getting fitter, not being able to run or ride fast enough. A large part of the recovery time post-op is obviously physical healing, but there was more emotional/mental healing than I expected. I didn't get my head around the fact that the physical recovery and healing takes time. I wanted to jump right out there and push everything before my body was quite ready for it.