How often do young men experience pain after they had their vasectomies?

Vasectomies only have lasting pain for up to about two weeks, and the pain/swelling goes down considerably even after just a few days. It will certainly not be a matter of months. You shouldn't do any intense labor immediately after your vasectomy, but after one or two weeks, you're good to go. There shouldn't be any recurring pain after the initial pain subsides, unless something goes wrong with the procedure.