we actually play two seasons but it's up to you.
I play around 20 teams a year counting the TOUR, and i play multiple seasons with a group of guys(usually four with parks and teams changing). Then I play a few theme leagues which keeps things interesting.
but it's well worth the 25 bucks to have the games played and everything calculated. Since you already use the computer game to actually play your games you already know about some of HAL's idiot moves.
TSN staff is working on incorporating some the features on the CDROM for next year as well....