It is recommended that you work on no more than two recordings at a time.
It is better to work on just one recording to give your mind one thing to focus on but find what works best for you.
If you find two is too much, just focus on one product and then move on to the next when you are ready. For the most transformative effect, you should aim to listen to your audio for 21 consecutive days.
If you would like to find out more about how hypnosis works, please see this article.