Oh dear lord...well considering Rxage took this HEROIC amount of speed nearly two years ago it's too late for this now, but...
Seriously: only 1/3 of Vyvanse is actual amphetamine (good stuff)! The rest is, like, amino-acids or some weird vitamin thing, or, I don't know. Lets see 240mgs!?! My goodness that's...80mgs OF SPEED!!!! Good lord, man! Not a fatal dose but...no WAIT, it could be! Cause, if you've got a small build and even IF you take that much with food that is high in fat your STILL gonna trip-balls! Not the dumbest thing I've ever heard, BUT CLOSE! Ichhhhh, I mean doses THAT high are right around the amount necesary to really bug-out (unhinders most unpleasant symptoms related to stimulants: paranoia, twitchyness [medicaly speaking...whatever!], high BP and heart rate...death)! NO NORMAL PERSON SHOULD DO THIS, CERTAINLY NOT A FIRST-TIMER. Dude, I'm 6 foot 3, 240 pounds and I usually take 120mgs of vyvanse (about 40mgs of speed) on a full stomach, then I'll increase by incriments of 30mgs of V (10mgs of speed) each following dose but NEVER over 150ish mgs....
Sorry for all the math but this stuff is important.