Don't skip using parchment paper in the bottom of the loaf pan as this cake bakes up moist and dense and parchment ensures the cake doesn't get stuck to the bottom.
If using frozen cherries, do not thaw.
Chocolate Cherry Loaf Cake should bake for about an hour, but you may want to start checking it for doneness after 50 to 55 minutes. To test the cake, insert a wooden pick into the center. If it comes out clean with just a few moist crumbs, the cake is done. If the pick is wet, try again in another spot to verify that you didn't hit a cherry. If it's still wet, then continue baking for a few more minutes.