Finasteride before Hair Transplant

I know you suggest finasteride after hair transplant to prevent shock loss. How long would you use finsateride after a hair transplant to prevent shock loss?

I generally like the man to be on finasteride at least 1-2 weeks before the transplant and until the transplanted hair has grown out. That applies to men under 35 as a rule, but what finasteride protects, is loss of the native hair with miniaturization present. As men get older, they may have less miniaturization and as such be less likely to get shock loss.