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CLAIM 1: It only takes 21-days to form a habit | Digital Psychology Training for UX, Design & Marketing
From my own experience, there appears to be a scientific trend (that I have not systematically evaluated) that successful behavior change programs tend to run for approximately 2-months, and that after this point, there is a large drop in adherence and impact. The big statistical meta-analysis that I carried out a few years back (http://www.jmir.org/2011/1/e17/), showed that online programs lasting more than 4 months, all failed. So as a rule of thumb, for most general purposes, 8-weeks is not a bad approximate time duration for many programs.