I’ve known a couple horses this year with this problem. It’s been slow going, and they aren’t at the other side of it yet so I’m not sure how long it will take ultimately. One is back in light work, following onset of lameness at end of April/beginning of May. Which seems pretty quick to me.
I had a bone bruise myself years ago that took 9 months to resolve. My ortho said at least 6 months, but in athletic people, could be 8-9 months. It was around the 9 month mark that I noticed that it wasn’t a constant bother anymore.