Well, i say monster, we went 26 rounds in 3 nights of being out of town. I'd say about i got about 2 hours of sleep a night, even though i was in bed 10 hours......
I took 1 tab on friday night, and then 1 more on sunday night. The one i took on friday lasted all day saturday as well.
I did notice a huge difference when i took it on an empty stomach (friday), than when i took it sunday night after eating.
I can't imagine taking more than 1 tab (20 mg) but then again, i am young.