you stop breathing.
No.
It begins to hurt.
I don't know cause I keep eating it at 12 minutes
If it's wood it doesn't matter. However if your head is plastic it is better to keep it inside because the cold makes the plastic brittle and more likely to break.
keep your head underwater for less than four minutes at a time. Keep the cast wrapped in plastic. Use soap and shampoo. Rinse throughly. Godd Luck!!! I have a cast on my foot right now and I bought a water boot that makes a vacuum seal over my leg. it works great
never ever let a child lay down after they hit their head, keep the child upright and awake then see a physician.
keep your head up
keep plastic products
boil koolaid, poor it into a tall plastic glasss, keep your hair in the glass for about 20 minutes, rinse it with cold water, dry it and tada!
the plastic one
PLASTIC!
The answer to your question depends on the temperature of the water relative to the temperature around the cup. I wouldn't bank on more than 2-3 minutes.