Sentencing, Plea Bargains sentencing time

[flowerpower57]

If someone gets a sentence of 40 years, how much of a portion would they have to serve? How does it work for any sentence, what is the portion in general?

 

[mightymoose]

There are too many variables.

 

[flowerpower57]

Can you kind of explain it to me, I've never had to deal with any of this before and I don't really know how it all works. What would be some of the variables?