NHL games must reach 55 minutes of play for bets to stand. If a game is suspended before the 55th minute, bets are void unless the result of a market has already been clearly determined during the normal course of play.
If a game is suspended, Head-to-Head, Puck Line, Total Goals and Correct Score markets are void, even if the outcome looked like they were decided. Period markets are void if the period isn’t completed.
For more information, see the General Rules, Tickets & Wagers article.