That is actually a better sentence than one year (the judge did him a small favor). Any federal sentence over one year qualifies for "good time credit". Good time is 15% of the sentence which is granted upon arrival. This is the best he will do, he can only lose this good time by getting into trouble while there. He will do 311 days and then deal with whatever supervised release time that was on his sentence.
https://www.inmateaid.com/ask-the-inmate/a-year-and-a-day-in-federal-prison-how-much-time-would-that-come-out-to-and-is-there-any-programs-that-will-decrease-the-time-as-well.amp#answer
Accepted Answer Date Created: September 24,2015