I wish I could tell you. I tried for years to drop it but I can only do it for a few weeks at most. I will tell you that it's probably a good idea to drop it periodically since your body acclimates to it and it compensates overtime for the extra edge it gives you. It's like any other drug. You need more to stay ahead of the body's compensation.
The edge it gives you declines over time to the point that you need it just to function normally.
The edge it gives you declines over time to the point that you need it just to function normally.