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Planet Jupiter
Percocet and Percodan
Urinary System

How long does it take for urine to go stale?

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Wiki User
August 25, 2011 8:24AM

It depends on the environmental conditions but it starts becoming foul as soon as it leaves the body as the various chemicals separate and yeasts and bacteria start to break it down. Certainly within a few hours in warm conditions it will start to evaporate ammonia. The remaining liquid then continues to evaporate which leaves a powder residue which is mostly phosphorus and salts.