On average, for how many years will a person be in prison for a life sentence?
Just looking for an average, not an exact number
It depends on his crime, time served, behavior as a prisoner, and a positive response to an appeal(s) and who is on the parole board.
an unrealistic amount of human life span, like... 100 years for example
I've met guys that were given life out in 7 up to 19 years
Life without parole? http://sentencingproject.org/doc/publications/inc_federalsentencingreporter.pdf
Probably ONE HUNDRED YEARS