I started riding the last two weeks in August 2018 in zwift and it auto set my first ftp to 147W and I was 170lbs. After some free riding I started the 4wk ftp builder in zwift. I ended up not doing the final ftp test in there, but instead jumped right into a trainer road ramp test and got 230W @156lbs. That was about 10 weeks from couch to back in better riding shape than I have ever been in. I’m now halfway through the mid-volume general build plan in TR and just did the half way point ramp test and went up to 238W @155lbs.
Pretty happy with the results so far (and the weight loss!), but I really want to get much stronger on the bike, hoping I will be able to do that!