2.5 years and my collar bone is healed about 50%. For most of that time, it
had only healed 20%. My non-union is fairly rare, but it was the last 1" of
bone, just like yours. From what I understand, collar bone non-unions are
less rare when you get out near the end like that. I had to use two
different electro-stimulation units to help bone growth.

' hope your recovery goes better than mine.

-Bob