> For persons convicted under civilian federal law after November 1, 1987, federal parole has been abolished, but the parole statutes continue to apply to prisoners who were grandfathered in.
https://en.wikipedia.org/wiki/Federal_parole_in_the_United_S...
However, there are other options for early release, namely the First Step Act.
> The Act amended 18 U.S.C. § 3624(b) so that federal inmates can earn up to 54 days of good time credit for every year of their imposed sentence rather than for every year of their sentenced served. For example, this change means that an offender sentenced to 10 years in prison and who earns the maximum good time credits each year will earn 540 days of credit.
1 year in halfway-home, pre-sentencing, drug program , up to fifteen percent time reduction for good behavior. it works out to only 80 percent of the sentence served.