I don't think i'll ever peak for 5 hours. although at raves i feel pills last much much longer. the peak normally lasts about 3-3.5 hours but i'd say after my peak dies im still on a plateau that can last anywhere up to 2 hours.
I would say I nice MDA/MDMA dose maybe I might get a five hour peak, I had a 3.5 to 4 hour peak of a green fish a couple of years ago and that was at work hehehehe.
Peace LOve and Mungbeans