If your husband was sentenced to 120 months imprisonment on a federal offense, the best source of information regarding his case is his experienced federal criminal defense attorney. Your husband's attorney will have all of the pertinent information and will be able to discuss the good time, RDAP, and any other credits that your husband may be eligible for. Pose your questions to your husband's attorney. Good luck.
The BOP allows credit for "Good Conduct Time." That is 13 percent of the sentence (15.6 months) IF the inmate stays out of trouble (which, honestly, is not always up to the inmate). Depending on needs for substance abuse treatment, inmates can apply for the Residential Drug Abuse Program (RDAP). If admitted to and successfully completing the tough RDAP program, inmate MIGHT qualify for up to 12 months of additional sentence reduction. RDAP does ensure six months of halfway house time, as the "transitional" phase of the program (technically the sentence reduction does not vest until the inmate actually moves back from BOP to USPO supervision).
Most importantly, DO NOT LIE about having a drug problem to apply for the program. Not only are DAP staff trained to spot malingerers, they are first Correctional Officers in mindset. That means they often presume deceit on inmates' parts and think like a psych professional in that frame. THAT means liars about drug problems are making potentially HUGE problems for themselves.
Second most importantly, DO NOT buy into these cold-calling/emailing/faxing "consultants" who will guarantee RDAP placement. I think of one group that wanted my permission to contact a gun defendant about RDAP and its potential time off, without ever looking up what I do, or what my guy's (disqualified from time off) offense was. But there are plenty of other "professionals" out there to avoid. In sum, if any "professional" promises more than honesty and best efforts in a BOP issue, run run run the other way.
This answer DOES NOT create an attorney-client relationship, and DOES NOT address the many specific and confidential variables needed to provide adequate legal advice. This answer is ONLY general guidance.
Your husband may parole out or even have a sentence reduction by attending rehabilitation programs while incarcerated. He may obtain good conduct credit which will allow him to discharge his sentence earlier too. There are too many factors involved and none of us can predict the future to determine how much time he will actually serve in prison.
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