Depends what you did with it. If you stuffed it down someone's throat and killed them, probably life. If you used it for official purposes or in a fraud, depends on the seriousness of the crime and your history. If you merely had a fake passport in your back pocket, it depends why. More details....a better answer
wll, here in the UK, you dont pass go, and get deported, after spending a while in prison, where you will be brutalised and segregated... and when you get convicted, you enter the population, and believe me, you'll wish you'd stayed where you were.