This is my (CotySA) improved speedrun of Tom Clancy´s Splinter Cell, done on hard difficulty in 24 segments.

Training 0:00 (6min30sec)
Police Station 7:59 (4min14sec)
Defense Ministry 12:17 (6min11sec)
Oil Refinery 18:32 (4min33sec)
CIA HQ 23:12 (5min53sec)
Kalinatek 29:11 (5min49sec)
Chinese Embassy I 35:07 (5min38sec)
Abattoir 40:50 (3min53sec)
Chinese EmbassyII 44:48 (6min08sec)
Presidential Palace 51:02 (6min48sec)

The final time is 55 min and 37 sec, measured from gain of control until the "mission complete"screen appears (loading times were factored out).