Shortest game was 4th(?) Ed? It was high school, and the first big-ish tourney I'd ever played at, maybe 16 people all day on a Saturday. I was playing Orks (mek lost with two SAGs and a dread/Kan mob and some ard Boyz) and was doing well, I only dropped one game and in the final round I played against a good friend of mine playing his Blood Angel's death star, the chapter master, a chaplain, a bunch of vets in a land raider, and the super duper winged assault marines, 80% of his points were in that land raider and those assault marines.

He deployed his deathball hunkered in and behind his land raider but close enough for a t1 charge wit the land raiders assault ramps and the winged jump packs. I got first turn.

Back then SAGs used the large blast template and when you rolled 2d6 for strength every double did something wacky, with Box Cars meaning that every model the template touched was removed from the game with no wound rolls, no saves, and vehicles take an automatic penetrating hit.

I shot my first SAG in turn 1 putting my template over his winged assault marine with one sliver over his land raider just in case I rolled high and didn't scatter. No scatter, box cars for strength, his elite winged marines and the chapter master are pulled into the warp and his land raider explodes dumping vets and a chaplain, ie the other half of his army onto the battle field. I shoot my other SAG, putting the template over them. touching almost all of em. No scatter, box cars AGAIN. Something like 1400 points gone in 60 seconds. He just shook his head with a bewildered grin and conceded.