Nobody's goling to jail for 80 years; to think he may is to misunderstand American justice at work.
The 80 years is the stick; the carrot is the plea bargain. If you refuse to cooperate they may try you with whatever relevant charge and with the prosecution's sentencing recommendation of 80 years, but there will be some rather attractive options given the accused. If he pleads guilty and admits his role, they probably will counter with a maximum of
Then there is the sentence itself. No-one in America serves the sentence they are given, with the exception of natural life sentences. It is actually against the law to not offer time off for good behaviour
How much time off varies by state and also the Federal system has guidelines as well. The Federal system is the most stingy. Calculating the reduction is so complex that in many cases even prison officials can't tell you the actual release date with good behaviour included (partly because it requires predicting future behaviour, as the reduction is earned per 30 day period of actual time served); one day they figure out you are due to be released, and the next day you're out is often how it works.
But for non-violent offenders, it can be as much as two thirds of actual time served. So a ten year sentence could be fully completed in as little as 3 years and a number of months. And, because good time and actual time are treated identically, that means you are eligible for parole after serving some portion of your sentence, which in this case would be some portion of three years and some months.
Finally, because so many involved in the Justice System are elected, it serves the purpose of "law and order" politics to publish long sentences in the press, when the actual amount of liberty deprived the offender is much less, which is almost never followed up on in the press (with the exception that if an individual re-offends they may list the previous crimes he was convicted of, and the sentence, and the release date, which inevitably illustrates the above is true).
Some jurisdictions give time off merely for showing up at the jail, that's how people in the news like Lindsay Lohan serve 30 day sentences in four hours. But generally speaking most states allow 10 days per month served, plus often additional days if you do things like take a prison job or complete some program, and in some states you can earn up to 20 days per 30 days served. The Feds tend to be closer to 5 days per 30, but you can still earn extra with them as well.