lol,, Thats the half life? I thought it was just called the amount of time you'd be high on them. lol
its has a half life of approx. 4 hours
Half life is 3.8 hours, which means that after almost 4 hours half of whatever you took is out of your system. So if you took 30 mgs on Friday at 6pm at 10 pm 15mgs would be left. At 2 am 7.5mgs would be left. 6am 3.75mgs would be left. ect..
I don't think it has a half life and would not show on a UA after about 3 days. How long to feel normal would depend on how long you've been taking it and how many daily. Are you addicted?