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Originally Posted by Trustme  I am a firm believer in the 30day challenges/trials, whatever you would like to call it. For me it's 21days because I prefer the number and there is this saying "it takes 21 days to build a habit". |
I think the rationale behind a 30-day trial as opposed to 21 days is that you go through the 21 days that build the habit, and then once it's built (so you don't have to exert a lot of energy to maintain it), the remaining 9 days allow you to get a feel for what life is actually like with the new habit so you can objectively evaluate it.