Re: More questions about pinhole leaks in copper pipe
Not a plumbing expert, but I agree with bp21901 about the length of time.
If you use a rubber patch and a hose clamp it will work. Had the same situation once with a nail hole in a copper pipe, solid stream. Had other projects going and needed a quick fix until I could get to it. I wrapped rubber patch around pipe and installed hose clamp. I know it worked for over a year because quite frankly I forgot about it until I did some re-plumbing. Be sure to wrap the rubber completely around the pipe so the clamp doesn't make direct contact with the copper.
Be sure you live your life, because you are a long time dead.-Scottish Proverb