When ever i consumed high doses I always marked the expected peak time and eta to near baseline so I could use that to calm myself if I became too high. I don't expect this approach from most people. And that worries me.
It's a amazingly calming feeling to be able to say to oneself "wow I am really fucking high only 1.5 hours to near baseline" while staring at a third eye on your best friends forhead.
I don't really use them any more as I am enjoying sobriety more and more as I get older.