Longest: Tubular Bells - 49:16

Shortest: 4'33" - 0.00

Facepalm.

Shortest: Boyd Rice and Friends - Tripped a Beauteous Maiden (0:37)

Longest: Henryk Górecki - Miserere (32:42)

Egg "Bulb" Time: 0:07
Emerson, Lake & Palmer “Karn Evil 9” Time: 29:36

Shortest:

Tomato Ambient Sounds (WAVs I archived from Underworld's graphic design site in 2005) - "Underworld [12]" - 0:01

Longest:

Ambient Atmospheres for Study & Sleep (from a library of field recordings I compiled) - "Rain 01 10hrs" - 10:01:23

2 thumbs up from me

One of the two defining things about 4'33'' is its duration. Saying it has none is dumb.

Also, 4'33" is available commercially on iTunes. (Interesting that the price of silence is .99), confirming an official MP3 duration.

Tie between:

Yeah - Kyuss
and
The Sky is a Harpsichord Canvas - The Olivia Tremor Control
for 00:04

and

Tepeu by Q'uq'umatz at 24:52 not counting the 40 minute hidden track songs from Deftones and Goldfinger.

At least I'm winning for having the longest.....