habit breaking vs. trial
I think 30 days is a generous chunk of time to give yourself a new way of being to see if it works for you in creating a life you love. If you're trying something new that you suspect will be a positive change, 30 days is a commitment that's not so daunting that you would immediately rebel against it; you're giving yourself the option to let yourself out of the deal if it doesn't work for you. And it's a long enough period that you can see the benefits or lack of benefits clearly enough to make another choice at that point: is this worth pursuing as a deeper commitment, or would it be a wise choice to let go of this one and try something else?
If 90 days works for you, try 90 days. For me, 30 days just seems more manageable -- more of a free gift I give myself, and less of a burden. I'm sure the particular period that works will vary for the individual. For 12-steppers, it's one day!
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