Normal length of a 45 is about 3-4 minutes. I always wondered how long these things can go when spinning at 45 rpm.
Bruce Springsteen - Fire b/w Incident on 57th Street (Columbia 1987)
This is by far the longest one I have.
The B-Side here clocks in at a whopping 10:03. It's not very loud, which probably enables it to be so long.
If anyone knows of one any longer, I'd love to know what it is. 7 inch records that play at 33 don't count.