Small (3 mm) side to side all the way through hole in frenulum (penis). no pain and not sure how long its been there. how long will it take to heal?

Here are some ...: The specifics in this Q is unclear to offer a specific answer. Generally speaking, a uncomplicated fresh scratch or laceration will heal in 5-10 days, but if such wound is inside the chronically inflamed foreskin, the course of healing will be protractable and lengthy of uncertain period. To decide the fate of such wound, a direct inspection on the penis is needed. So, seek professional attention.