This kinda sounds like a dick sizing thread. I was prescribed 60 mg/ day Adderall. I had to dose twice a day. 4 hours on the nose. That was a great dose for me. I took 120 once and tweaked out a little bit. It was fun, but wont do it again.
The average starting dose is 10mg to 20 Adderall. I've heard of people doing 600mg in a day, but if you did a gram in short order, that would be side effect city. Like other posters said, it depends on the individual.
I have ADD. Currently, I take 70mg Vyvanse and that almost does the trick. Today, I'm on 120mg Vyvanse. That's like 60mg of Adderall.
OP, start low, and don't push it. You really don't need to go past 60mg-80mg of Adderall. That dose will buzz you fine. 120mg at the most with a tolerance. At that dose, you will be plenty focused and high. Don't snort it, parachute it. It will hit harder.