Urine is typically sterile when it exits the body, but it can become contaminated with bacteria from the skin or external environment within a few minutes to an hour.
Urine is toxins from your body and while it is sterile while inside you, it is a biohazard when left to sit for long periods of time
In my past experience, more than a week is too long. It does spoil and can grow microbes even though urine in the body is sterile. Refrigeration can allow for a longer life, but oxidation does occur.
Nothing; your insides are soaked with urine. A less jarring way of putting it is that urine, by itself, is not all that bad as liquids go. It is, in fact, a filtrate of the blood. The kidneys are filters, and when blood passes through the kidneys the kidney output is urine. Urine is as clean as the blood itself, unless there is some infection in the kidneys, bladder or urinary tract. So wherever there is blood in the body, and that covers very close to all of it, there is also urine ready to be filtered out. Urine does not remain a sterile or nearly sterile liquid for very long outside of the body. There may be germs even at the point of exit that contaminate it. Anyone knows that urine will reek if left out or remains on surfaces for any length of time. Various bacteria live happily in it.
As soon as your body has absorbs it which is not long
Urine typically stays warm for about 5-10 minutes after it is expelled from the body.
Urine is sterile, so there is not any danger, so long as there is not an existing health condition with the person who is urinating.
The body typically processes water into urine within 2 to 4 hours after drinking.
It typically takes about 6 hours for water to be converted into urine in the human body.
5 days
The human body typically takes about 2-5 hours to convert water into urine.
Urine is formed continuously in the body as the kidneys filter waste products from the blood. It typically takes about 1-2 hours for the kidneys to produce a sufficient amount of urine for it to be expelled from the body.