If your H is sincere in what he said, it's going to take a LOT of time. He didn't start his affair immediately and he's going to take a lot of time to get past it. It's an addiction.
True, but he CAN commit RIGHT NOW to no-contact and transparency. The WITHDRAWAL will take a long time to completely happen, but the DECISION can come in and instant, and it needs to, in my opinion.
I truly believe what they mean when they say "Love is a decision." I think fidelity is, too.