I pretty much vote with my feet if a pop song is over 3 minutes long, an album is more than 35 minutes long, or a film is over 100 minutes long (the definitive 'Paths of Glory' clocks in at 86 minutes).
If it can't be said in that time, don't bother.
Ditto TV - if it's divided up into 'seasons', comes in a 8 dvd box set and, frankly, is American, I'm out the door.
Fave TV series? - 'The Prisoner' 1967-68, 17 episodes.