Training non-dominant hand

No.5906919 ViewReplyOriginalReport
How long would it realistically take for me to train it to be half as good as my dominant hand? Does anyone have experience with it? I have reasons to believe my right hand will die in one or two decades.

Weird fact about me: I was born lefty, but my school teachers forced me to use right. I now write in my left hand way worse than most natural righties.