Drink/test question

Got Qcarbo32, might be tested tomorrow. I drank it tonight though, and I guess now I am reading that is "effective" for up to 5 hours. So basically i wasted 50 f***king bucks, or does it still help to empty out my system, or is it just a blocker, in which case maybe its better off because that would maybe make it a negative. I have been drinking water and doing my thing (done it before, but last time smoked for those times was a week before the test). This time was last night, special occosion, and I probably should not have. No definite test tomorrow, but possible. So I will continue to drink water and decaf tea. Any thoughts on the qcarbo and if I wasted my loot. Also, if I am gonna have tests this summer or whatever, and know about it a day or less in advance, does the dilution really work with 24 hours, or should I just use the qcarbo correctly. I know that I will prob have to quit for employment (could be permanent) but wanted to see if there was a possible way that was at elast 75% effective or whatnot. Pretty skinny/active kid, lazy lately, but only like 150 and 5'9". Thanks.