First, you don't get sentenced to "days" in federal court. Second, if you got sentenced to 12 months in federal court, you will serve 12 months. If you were sentenced to more than 12 months, you may get 15% off.
I agree with my colleague's answer, but since you are asking about "days", then the answer to your question is: 364 days
You will spend one full year in federal prison. Speak with your attorney.
Experienced Criminal Defense Attorney--Former Prosecutor--Put my experience to work for you!
364 days. Only sentences of more than one year (that is, 366 days or more) are eligible for Good Conduct Time credit.
If sentenced to more than one year, the Bureau of Prisons will credit about 12.86 percent of GCT, or about 47 days per year. It is authorized to give up to 15 percent, or 54 days per year, but it does not. (They calculate based on time served, not sentence given).
This answer DOES NOT create an attorney-client relationship, and does not address the many specific variables that would constitute responsible legal counsel. This answer is meant only as general guidance -- particularly to hire an experienced lawyer for this complex question.
While the typical preferred sentence in federal court is "a year and a day" to get the credit all the other lawyers are mentioning, there may be a reason why a sentence of just under a year makes sense for a variety of consequence purposes. There must be plea negotiations and I'm curious to know why a sentence of a year minus a day is being contemplated rather than a year and a day, because you will effectively serve two months more time.
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