Yes, I passed "debris" with urine for almost three months. A few bits of what I thought was suture material as well, but none of the length you mention (1/4 inch would have been the largest).
The longer pieces for me actually came out through the skin in the areas around the incisions. I had large suture material (the surgeon identified it as what is used on the internal muscle layer) that would pop out like a bristle, then work its way out. That could easily explain the length in your case.
As always, ask your surgeon if you are concerned.