He was convicted in federal court. There is no longer parole in the federal system; there is a limited amount of time off ofr good behavior in prison, but it cannot exceed 15% of the sentence. So he will serve, at a minimum, 51 months.
Oops, I misread the article. If he is sentenced to 5 years, he will serve a minimum of 51 months; he hasn't been sentenced yet. Five years is the statutory maximum.