Their last few records, song lengths listed from short to long (not in album order)...
Black Clouds & Silver Linings, 2009 - 6 songs, 70 minutes ... 5:26, 8:36, 12:50, 13:09, 16:11, 19:16
Systematic Chaos, 2007 - 8 songs, 73 minutes ... 5:36, 6:01, 6:55, 8:54, 9:00, 10:44, 14:57, 16:39
Note: two of those tracks are parts 1 and 2 of a single 25:39 song.
Octavarium, 2005 - 8 songs, 72 minutes ... 4:30, 5:19, 6:47, 7:36, 8:13, 8:40, 10:43, 23:59
That gives you a good idea how long their songs are ... and why it's hard for them to put together a good set with only 50 minutes to play.
Oh wow, I was right haha, I was just going off a hunch.