Admins: this topic contains spoilers for those, who didn't play Deus Ex singleplayer. Don't ruin your game experience!
Wow. 43 Mins.
http://www.archive.org/details/DeusEx_Realistic_4320
The player used some weird bugs I've never seen before too, to skip parts. Double grenade jump, some weird 'stand on grenade and phase through thin wall bug' thing etc. ( Easily the best 'nade jumper ever too. :p )
They did some levels in seconds, where it took me hours.