We recommend sitting each level for 1 whole month -- that's 1 listening session a day, for 6 days a week -- with a day off for reflection.
Every month, you will advance to the next level (the next MP3), and continue this enjoyable, life-bettering process for 6 months.
At the end of your dedicated 6 month evolution, you will revisit each level for a day - over 6 days. After this final re-visitation, you are considered a BrainEv graduate.
At that point, you can continue to sit each level as you deem fit. We suggest revisiting the entire program once a day, every 2-3 months or so, to keep your new-found "mental muscle" as toned as possible. We have also recently released Level 7 as a powerful continuation of the program.
Once you have graduated, you may wish to get in touch with us to discuss how you specifically can continue using the program, or discuss the matter with other enthusiasts on our forum at http://www.brainevforum.com/.