well it is 8-12 hours... but currently the dea is having a hard time getting cases through, yuou ask why...
even if you take it every day with Bromocriptin which will keep it from converting to prolactin your system is so naturally saturated with it that the "beond a shadow of a doubt" is going to cause problems...

this is how you would get burnt, like a tottal idiot take it right before you get in the car to take a drive and you are clearly in the DUI plank or the test is conducted at that time and you are SOL....