It turns out no one can agree about the rules in roller hockey and the length of the games depend on who has appointed themselves “king” of that league… Hopefully the below acts as a useful guide. So, how long are roller hockey games? Roller hockey games are different lengths depending on the league. In USA Rollersports they are 2 x 20 minutes, British rules are 2 x 18 minute halves, some leagues are 3 x 15 minutes, and some 4 x 12 minutes. Most games are between 20-50 minutes long. But there are different rules and regulations that will affect the true length of the game, especially if the game isn’t won by one team or the other in this period