Bruxism isn't as bad as earlier, but that's not saying much given the nystagmus, gurning and mydriasis were on par with the results of MDMA/Amphet combos.
Duration is difficult to state as it's very easy to focus purely on the (Close to Cocaine tier) overwhelming rush when vaping, paying little attention to the body of the experience.
My last vape was around 8pm, so 3.5 hrs since and I could easily convince myself I'm sober. I'm certainly not sober, but I feel vastly different to the sensations elicited in the acute, compressed, incredibly unique rush/peak.
Clear residual physical stimulation has me messing with my hair and rearranging my glasses every 5-15 seconds, my normal/sober fine motor tics (rubbing the knuckle of the index finger against that of the middle one/tensing all right hand appendages and rubbing my thumb knuckle across my palm) are accentuated, exaggerated and frequent, though Amphet. is infinitely worse by comparison.