It usually takes 3-4 weeks of listening to the CD to achieve sustained improvement.
How Long Do the Results Last?
A human organism is a dynamic system with continuous adaptive changes. Repeatedly using the same therapy may desensitize the human body to the original effect. This pattern may also be observed with individually tuned music files.
If after a period of success, you begin noticing a reduction of the original effect, your brain wave patterns have changed. The best solution would be to record a new EEG and obtain a modified set of music files.