That's not quite what mindfulness does in the long run. It actually reduces gray matter density in the amygdala, which is associated with immediate stress response. These changes are permanent. Therefore, it not only helps you "handle" stress, but also causes situations to "cause" less stress in the first place. Check out https://news.harvard.edu/gazette/story/2011/01/eight-weeks-t...
Also, you do not actually need to practice an hour a day to get the benefits. The above study has participants practicing on average 27 minutes per day.
