At the Akkala Ancient Tech Lab, Robbie's machine, Cherry, can build several ancient weapons for you. They cost a lot in rupies and ancient parts. I'm really interested in the Ancient Bow, but don't want to drop the rupies, gears, and giant ancient core if the bow ever breaks or breaks as often as other bows. How durable is the ancient bow Cherry makes?
In the specific case of the Ancient Bow, it is the most durable bow in the game without Amiibo items. It has a durability of 120, which for bows seems to be the number of shots it can fire, so 120.