acctualy i havent ever had problem to have to redose with speed, so why would i with mdpv?? i was thinking about to take speed first, and maybe 6 hours later to take a dose of mdpv... how long does it acctualy last? will i be sleep tonight (in like 24 hours from now) if i start with the speed around 05:00 am, and then the mdpv around 12:00 pm ???? the time here now is 01:45 and ive ben already awake for like 9 hours