It depends how healthy and fit he is but it will very from person to person.
It is generally considered that an erection lasting more than four hours is unsafe, because lack of blood flow to the penis and surrounding tissues will ultimately cause injury.
An African man's penis can grow up to 35cm erect and 15cm non-erect. Some men, their non-erect length is only 1/3 or 1/4 of their erect length.
Stay in shape is the best way. Relax and know that it is possible to go soft. But given time and you will come round.
forever
fu
No.. But it does of course make it more vulnerable to pain since it's erect. Bending it or anything similar can hurt it, but if a man is erect for too long without ejaculation, it causes pain to his genitals.
No, as an erection is caused by the flow of blood to the penis. If a man is dead, his heart no longer works and so cannot pump blood to the penis.
1 year
His penis will erect.
When a man thinks about things sexual his penis becomes erect until left alone or satisfied
There is no way of knowing. I have personally seen ones that are one and one half inches long erect.
He satyed their for 8 days.
Apart from chemicals such as viagra, stimulation would be the way to go.