Penthouse (Shattered Glass) done in 0:45. Can definitely be improved by a few seconds with more luck in regards to the movement of the first floor guard who is alarmed by the smoke grenade, as he can open the door to the room he is guarding, which did not happen in this attempt. I also utilise the known glitch whereby a third operative can sit in the extraction zone to end the mission once the two bugs are placed. I might do a glitchless run in the future with both operatives returning to the roof, as it is in the spirit of the level. [more in-depth description on Youtube, if desired]

In any case, 0:45 is a good benchmark. Will be seeking to improve on it in later attempts.