Well...huh!
News broke a quarter of the way through the season that Bulls head coach Billy Donovan signed a contract extension before the season started:
Donovan had two years remaining on his original four-year contract and is now under contract for several more years.
Nothing more specific than that, like how many years guaranteed. Unfortunately the local beat is useless. I also recall that the original Donovan contract was pretty high on the coaching scale, but that may have never been specifically reported either. I guess they finally stopped paying Jim Boylen last year and that money shifts to Donovan as a write off or something.