I have a comminuted fracture to the radial head in my right elbow. it's been 9 months and i'm still in pain. how long does this take to heal?

Fracture: It would have healed by now normally. But did it heal correctly or not, that's the issue. If there was also damage to the adjacent nerves, this may be responsible for your pain. Get a work up.

Before now: 9 months is far to long. You ask how long it takes to heal so i assume you have seen an orthopedist who verified that the bone has not healed. (just because there is pain does not mean that the bone is not healed). If that is the case you have a malunion. It ill likely need surgery.

Radial head fracture: Heals in the same time frame as most bones in most healthy persons 7-8 weeks. Pain can be from the severity of the fracture and joint and tendon mal alignment, elbow ligament problems, joint stiffness , and a host of other issues. Speak to the treating physician.