Fans without ACCN have my sympathy -- my cable system picked it up almost a year after its debut -- but I feel like Duke has been on the ESPN networks often this basketball season. Of the games they played:
ACCN
Boston College
Wake Forest
at Virginia Tech
Notre Dame
at Wake Forest
ACCNX
Coppin State
RSN
Bellarmine
ESPN/ESPN2
Michigan State
Illinois
at Notre Dame
at Pittsburgh
at Louisville
Georgia Tech
Clemson
at Miami
UNC
at NC State
(Still to play, all on ESPN or ESPN2: Virginia, Syracuse, Louisville, at Georgia Tech, at UNC)
If your emphasis was about Saturday night availability, the only time Duke was on ACCN this season was the home game against Wake Forest. Also Coppin State, which was a Saturday afternoon game.