How long does discoloration last from having bashed my nail with a hammer?

I bashed my thumb nail with a hammer. It was tender at first but healed fine. The nail itself seems strong. The hemorrhaging behind the nail resulted in what is now a black color and is roughly circular with a ¼-inch circumference. The nail continues to grow, but the discolored area behind the nail remains in the same position and takes up about half my cuticle area. The nail itself is NOT the problem. How long does the black color BEHIND the nail last? It’s been five weeks since I hit my nail.