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and it gos off and stinks

About 3 sets of Olympic Games back, the Russians were quite sneaky about the drug tests. They'd urinate before they started training with steroids, and froze the sample. When it came time to do the tests several months later, they thawed the samples, and put them in condoms. the condoms they put up their asses, with a tube running from the opening along to the ends of their dicks, hidden with pubic hair. That kept the sample at body temp, and because they had to be watched giving the sample by officials, they could just take the plug out of the end of the tube, and it looked like they were actually giving a sample

I think a trainer came clean after the Olympiad tho..

how long would piss last at room temperature?

not very long. it will sediment and go really smelly. a person trained to perform drug testing will pick you up straight away....