It may have no effect for some people. I practiced samatha/vipassana for over a decade at a Tibetan Buddhist center. This included daily sessions, one and two week solitary retreats, week-end and month-long group retreats. I met wonderful people but I experienced no change in attentiveness, clarity, calmness, or acceptance of my shortcomings. Meditation instructors said, "Just keep practicing." I did, but eventually lost interest and left the community years ago. My level of attentiveness does not seem to have decreased since. YMMV.
https://github.com/jakwings/bash-totp