One reader brought up a reasonable point about giving oneself permission to go beyond the eponymous 15 minutes of the 15-minute Commitment.
The way I envision this plan is that 15 minutes is the point of entry in working toward a goal. Of course, you can always go beyond the 15 minutes, but if you’re prone to doing that, the 15-minute Commitment probably isn’t right for you.
That is, your problem might be one of time management, but it’s probably not one of motivation. 15MC is for people, like me, who have stymied their own progress toward a desired outcome, whether that be a finished book-length manuscript, a better diet, a more-toned physique, a cleaner house … whatever.
So, if the spirit moves you to devote more than 15 minutes a day to your goal behavior, by all means go for it. I think that, over time, the habit of spending 15 minutes on improving your life will naturally spur more time spent on doing so. But even if it doesn’t, at least you’re spending 15 minutes a day, five days a week, toward that end.
A caveat, however: Fight the temptation to use an especially productive day (say, an hour of achievement-oriented action) to justify blowing off the next day’s 15-minute Commitment. The habit of making daily progress is more important than banking up scads of progress followed by neglect, at least if you’re someone who has trouble getting going in the first place.
Better to jog 15 minutes a day than complete a 5K one day and spend the next 364 in a pizza-and-beer-induced torpor (as seductive as that sounds).
Ultimately, though, I’m not in charge of your 15-minute Commitment if you undertake this. Your opinion of what you should be doing is far more important than mine.