I'm guessing you took 2 750mg pills.. Which isn't really 1500mg of Vicodin. It is 750mg of acetaminophen and a small amount of hydrocodone(vicodin) but anyway, It will only stay in your system 3 days if that's all you took.
If I Had 1500 Milligrams Of Vicodin, How Long Will It Take To Get Out Of My System?