The answer: 2 games, as was announced by the NHL on Friday evening:
From the NHL:
Edmonton Oilers forward Taylor Hall has been suspended for two games for kneeing Minnesota Wild forward Cal Clutterbuck in NHL Game No. 246 in Edmonton on Thursday, Feb. 21, the National Hockey League's Department of Player Safety announced today.
Under the terms of the Collective Bargaining Agreement, and based on his average annual salary, Hall will forfeit $9,729.72. The money goes to the Players' Emergency Assistance Fund.
The incident occurred at 17:27 of the third period. Hall was assessed a major penalty for kneeing and a game misconduct.
NHL player safety czar Brendan Shanahan made it clear that Hall’s knee was extended, made initial contact and that Clutterbuck did nothing to facilitate the dangerous hit – in fact, he didn’t even have the puck.
Shanahan’s other major suspension for kneeing was the four games Kevin Porter received for kneeing David Booth. That hit was more predatory than Hall’s. Two games is about right for what was a dangerous, but not catastrophic, hit.