72 hours or nearly so, and basically worked the whole time too. It was the first time my roommate gave me Adderall to try. I did around 2 weeks worth of work in my auto body shop, then slept like 14 hours straight. To top that off I was around 350 pounds too. A week later I was on the stuff legit. Three years later I was racing bicycles and under 190 pounds. Three years after that, I was disabled from a crash with 2 SUVs.