Yes, but they should listen without headphones.
You can listen without headphones in the background as you carry out your work. DO NOT play while doing activities such as driving or operating heavy machinery.
The time varies with the product but one should invest about 30 minutes each day when you start listening to these audios. Later you can reduce your time without cutting down on effects.
To get best output. limit yourself to 2-3 different tracks in a day with a time gap between them. Avoid using more tracks in one day. Still there is no harm in using more tracks.
For better results, you must listen to it regularly for 6 weeks. Missing 2-3 days won’t make a difference. But one should not stop completely.
Children should not be exposed to binaural beats or isochoric tones. It is recommended above age group of 16.