[drh]

One more data point: Made the switch about two years ago here. At the time I was already fairly athletic, with normal BMI and in my mid twenties.

The first two weeks were incredibly difficult. After that you could feel the adaption kicking in, and by about a month I was able to stand for six hours at a time - punctuated by the usual trips to the kitchen and toilet several times per day of course.

Forget getting into the zone in this time. Compared with my peers, I would say I'm fast to adapt physically to new 'stresses' (from weight training and running in my experience), so I would judge this to be towards the 'best case' end of the scale.

Definitely agree that the author of this post threw in the towel too early. Standing for a full day is no mean feat. You wouldn't expect to run a marathon after two weeks of training having never run before.