Criminal defense lawyers typically say that a federal inmate will serve abotu 85 % of his or her sentence. However, the award of good time is discretionary witht he federal bureau of prisons. So, that is not a guaranteed figure. The federal system does not have parole.
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The direct answer is 85% of the five years with credit for pre-sentencing detention, if any. The better way to determine is to consult the defendent's attorney and BOP.
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Yes, he could be our security for unlawful reentry. If you were prosecuted for unlawful reentry, he would be sentenced under the United States sentencing guidelines, and there are a number of factors that his attorney, the prosecuting attorney and the judge will look at to determine a "reasonable sentence" in his case. Whatever that number of months maybe, he would be entitled to up to 15% off of his sentence for a good time.