If you're new to buying narrow beats I would not suggest listening to any track for longer than 90 minutes you can't go to the gym and leave weights for 10 straight hours. Yes, absolutely it's 100% already proved that listening on binaural beats are safe or more than it's very useful for your brain for working its cognitive and memorising abilities. In fact neuroplasticity allows the brain to continuously build and repair internal connections and whatever you are doing in any given moment.
If it were you'd never be able to form new memories or learn new things. Has anybody ever told you that your brain cells never grow back, that if you smack your head on something and kill a few brain cells those precious IQ points are lost forever, it's not entirely true.