Depends on how you play single player CCM. There's a semi-large player base that plays only a few games per season because it's terribly easy to go undefeated every year with a scrub team if you play the games. Instead we focus on team building, and see how our rosters perform in simmed games. I usually go for 10-20 seasons. The only reason i've never made it to 30 is because the CPU team building logic/ development has been historically bad, so by year 10 or so, my team is just OP. Also, controlling 32 teams is tedious and -for me- you lose the excitement of controlling "your team".
It seems like they've added a few good features to improve team development, so i'm pretty excited about that. I might match my record of 40 or so seasons playing NCAA 2004 back in the day.