1DVD conversion if I remember correctly took 12 minutes to install. not a big difference there.

on a side note, games that can be converted to 1DVD5:

Wheelman
Resident Evil 5
Devil May Cry 4
Darksiders 1 (2DVD5) or 1DVD5 without cutscenes
The Chronicles of Riddick: Assault on Dark Athena
Kane And Lynch: Dead Men
Crysis 1
Borderlands 1 with all DLC (2DVD5)
Mass Effect 2 with all DLC (2DVD5)

and a punch of old games i can't remember which one successfully converted to 1DVD5