Should I limit the amount of time time listening to 40hz sound

Dr. Andrew Huberman discusses the use of 40 Hz binaural beats for enhancing focus and motivation via increased striatal dopamine release. While he mentions that binaural beats can be an effective tool for improving cognitive work, he recommends not using them for every work bout to avoid attenuation to the effect. Specifically, he suggests using them for about five minutes before starting cognitive work or even throughout an entire session if you are particularly distractible. He also notes that it can be beneficial to use them prior to a workout, especially one that requires focused muscle contractions 1.

In terms of limiting listening time, while there's no specific instruction to limit the time, the suggestion to only use them for five minutes before work indicates moderate use rather than extended or continuous listening sessions. Additionally, to allow the brain to shift into an optimal state, he recommends trying a session of 30 minutes listening to binaural beats before doing a different activity and then starting your focused work 2.

It's always important to pay attention to how your body and mind respond to binaural beats and adjust the duration and frequency of use to best suit your individual experience and needs. If any discomfort or adverse effects are noticed, it would be wise to reduce the time spent listening or to consult with a healthcare professional.