Let's see:
CM01/02: longest save was until 2022 (started at least 10 saves)
CM03/04: longest save somewhere in 2019 (only started one save)
FM 2005: longest save somewhere in 2020 (started 2 saves, shortest one is in 2019)
FM 2006: longest save until now in 2017 (only one start)
So for me it's almost like the others. I have to admit I disliked CM4 a lot after I sold a player to some other LL team for 1.2 billion pounds.
2006 is my favorite tbh. When I was playing 2005 I stopped playing after around 2 months and picked it up 3 months later. With FM2006, I can't stop, I have to play every day, I'm addicted :o Like today I feel ***** because I don't have time to play. Luckely I have the rest of the week every night available