Nothing more than a scam based off placebo effects.
It's psychology thing, and we can go back and forth on it all we want without either side winning.
so how long does this keep you "high"
wait wtf do I do
Depends on the one you get. It varies from person to person too.
You download i-Doser, put some headphones on (ear buds are okay too, not as good as headphones. And this WON'T work on speakers.) and start a idose.