Looking back on it though, it does sound quite barbaric compared to what we have now. Back then the ideal method was to set up the ultrasonic somewhere we’d be most of the day and just let it play in the background. All you had to do was check to see if the ultrasonic was playing properly and you were good to go, also there were no washout periods needed.
Back when I was in high school my routine was to wake up at 7, play the ultrasonic version of QL and start my 1-hour playlist of YouTube subs/fields while doing homework at the same time. My high school started at 9, so I more didn’t mind spending my time doing this instead of sleeping in for an extra hour.