It's confirmed regarding Brendan Gallagher

This means the maximum number of suspension games he could receive is five. If the League had intended to give him a more substantial penalty, he would have had to attend an in-person hearing.

Gally is not one to shy away. He acted poorly, and he will face the consequences like a man. This action is inexcusable, and he is well aware of it.

However, he is not a repeat offender, so that's likely why he's getting away with five games or fewer. If we look at Charlie McAvoy's suspension earlier in the season, logic would suggest that Gally might receive an unpaid leave of four games.