If you don’t think NFL fans follow their teams through thick and thin you’re misinformed. Their season starts in September and finishes the beginning of Feb but they spend the seven months when it’s not on talking about it. There’s daily TV shows and endless discussions, NFL fans are completely invested in their clubs, it’s expensive as well, last week was Tampa hosting Green Bay, tickets started at $315 (around £300 for big standard seats.That's not right at all. Although, the culture seems very different. The importance of match day and following your club all over, though thick and thin isn't the same. They can't really be compared.
And to be honest, American football is on for so long, and play is so interrupted that you're probably better off watching it on the tele.