The NHL brought in the concept of a bye-week a few years ago, and when they negotiated the extension to current CBA in the form of the Memo of Understanding in 2020, they formalized the rules around the days off each NHL team gets.
Each team gets a break of “not less than eight days between scheduled NHL Regular Season Games during the period beginning five days before the NHL All-Star Game Weekend and ending five days after...”
For the Leafs, they play their last game on Wednesday, February 1 at home to Boston, and return to play on Friday, February 10 on the road in Columbus.