Closer to 10 months actually - Oct (Sept if you include the pre-season) through June.

But just to add on for comparison, the NHL has 1312 regular season games. Plus 4 rounds of best-of-7 playoff series with 16 teams making the playoffs. Let's say an average of 5.75 games per round, that's 86 playoff games bringing us to ~1400 games per year.

Over 4 years, that's 5600 games. The FIFA World Cup had 104 games this year. It's actually pretty impressive that the WC can even make 40% while hosting < 2% of the games that the NHL has. Or put another way, 1 WC game is equivalent to 54 NHL games - 2/3 of one team's full regular season.