Believe it or not, the time goes by really quickly. I had my initial appointment in October 2018 and had surgery May 2019. I actually went through GW hospital just because it was closer to where I worked and it was easier to get to appointments. But once you start the nutritional portion, it usually depends on what your insurance requires. I was required to attend 6 nutritional appointments and have a psychological evaluation. Once I completed my 6th appointment, I was scheduled shortly thereafter.
My husband went through AAMC several years ago and his time frame was similar to mines, so I think it mainly depends on your insurance and you not missing any required appointments. If you do, usually the time will start over. But both hospitals have good programs, I think AAMC was a little stricter in the after surgery eating requirements. I hope this helps.