when does a song become to long

[Rats]

when they just keep playing the same thing over and over. for example, The Beatles' "Hey Jude" and Derek and the Dominoes' "Layla"
However, a song can be long as hell and still be awesome, For example Dream Theater's "A Mind Beside Itself" is almost 20 minutes long.

[Fortech]

don't care as long as the song is good, it mainly does depend on the song

[jamesh]

a song becomes too long when it begins to suck

i've got songs i like that are over 20 mins.

i've got songs i think are too long after 0.5 seconds.

[Not Complete]

it could be within 2 seconds if i hate that song.

[Seedler]

Uh Sonatas and Concertos are sometimes 1hr+, when all three or four movements are played.