http://www.nfl.com/news/story/09000d5d821ce440/article/benson-to-serve-jail-time-during-bengals-bye-week-in-october?module=HP11_headline_stack For 20 days, he will begin his sentence October 17, which is the beginning of the Bengals bye week
It sounds like if he don't fuck up even more he will be out before their bye-week is over. 2 days off for every day he doesn't fuck up means he is out in 7 days..and that doesn't count reduction for overcrowding.