I've got an adult female that I adopted (I believe she was an import that was given up to the local herp society when the original owner couldn't do anything with her). I had her for about 9 months before she finally fed for the first time for me. However I do have others that were CBB that go on several months long hunger strikes throughout the year, ball pythons are actually kind of famous for it. As long as they have good muscle tone and don't appear to be losing drastic amounts of weight (get a digital gram scale to keep track) they'll be fine.
Hunger strikes will end eventually with nothing the worse for wear except for the keepers nerves.![]()