An hour should be enough to at least start working on a sword for Einar. He had promised, after all. He could decide which project to start for himself as he worked. It would be a good distraction.
Before starting on the metal, though, Damian began by sketching the sword and the runic circles he intended to use. The weapon needed to last a long time, so nothing too complicated—activating it shouldn't harm the blade much. Einar had mentioned her affinities with Water and Fire, so something to suit those elements made sense.
Then again, most Pathfinders used runic items to wield elements beyond their own affinities with ease. So something useful and not common.