I think your body takes a long time to heal and you need to stick with a healing protocol for at least two years, but I would expect you would be seeing healing well before then.
That said, it has to be a healing protocol that actually works. What are you doing now? I HIGHLY recommend GAPS. I'd suggest committing to 6 months and then see how you're feeling. You should be seeing healing by then so it's easy to motivated to continue. We've been on GAPS for a year now and we have a lot of healing still to go but we've come a long way so I WANT to stay on the diet. There's nothing else I would want to eat anyway.
GAPS has recommendations for gallbladder issues. Most likely your husband would need to take ox bile for a while to assist in fat digestion.