with two pars of boxer briefs on(bottle in pouch area of first pair) and a pair of blue jeans my quickfix stay roughly 97 degree according to the digital meters and it says 94 on the bottle for as long as i have the bottle in my pants. Drug testing labs use the same thing as a home test except in case of a positive result then they'll use the good test to confirm. pratise makes perfect, you got today and the weekend which is plenty of time