Welcome @cam77254, Like you, from what I've read the blood in the semen is expected or common but I'm not sure anyone knows for sure how long it may take before it's back to normal color. Here are just a couple of examples:

"It's common to notice red or rust coloring in your semen after a prostate biopsy. This indicates the presence of blood, and it's not a cause for concern. Blood in your semen may persist for a few weeks after the biopsy."
--- Prostate biopsy - Mayo Clinic: https://www.mayoclinic.org/tests-procedures/prostate-biopsy/about/pac-20384734

"You may see minor bleeding after the procedure. This is normal and often needs no treatment. You may see blood in your urine or semen (rust color). This may last for 1 to 2 months. You may also have light bleeding from your rectum if you have hemorrhoids. This can last up to 7 to 14 days."
--- Prostate Biopsy - Veterans Health Library: https://www.veteranshealthlibrary.va.gov/Encyclopedia/142,83022_VA.

I'm kind of the same when I have a procedure done and I have some of the symptoms they warn me about and they go a little longer than what the doctor mentioned would or might happen. I'm thinking if it were me, I might just give the doctor a quick call if for nothing else than to give me a little comfort knowing everything is probably OK.

Are you able to contact your doctor or care team, or send them a message on a patient portal to ask your question?