With desoxyn, I have zero impulse to redose. It's not like you're smoking crystal, or snorting it even.
Oral administration is the best for methamp, onset is delayed a LITTLE, but the levels of meth stay relatively stable in your blood. A single dose of 5-10mg will last me 4-6 hours.
It will not make you "tweak" like Adderall does, it is much cleaner, stable, and honestly I think it's harder to abuse. It's easy for people to do chronic redosing with regular adderall, because you need such high doses for it to work for your purpose, but at these high doses come NASTY side effects, for me, unbearable hypertension and jaw clenching, NO appetite. With desoxyn, there is no hypertension that I notice, my jaw does not clench, and eating is not as big of a problem.
Honestly, an IR dose of methamphetamine can sometimes last longer than an XR dose of dexedrine in my experience, and your doses with desoxyn are usually so low you don't get side effects, or any compulsion to redose.