He would still come after you, nothing would be able to stop him. I've done that before, just to test it, out of curiosity.
How long would it take? And can he take elevators, or...?
Depends I guess, I've never really timed it. Although, doors can slow him down at times (and maybe stop him for a few minutes) and so can other stuff (Like stairs or that little space 173 hangs out in under a set of stairs/catwalk). He can't no-clip through anything, so he must find a way around.
His pathfinder isn't the best and doors and secreity would take a tole on his speed, however he WILL go to the other side of the map eventually, he'll use elevators etc.
One time I found the 096 event and as soon as the door opened, he was looking right at me. After a bit of nocliping (not far at all, I actually only went just outside of the map). The door to the event automatically closed on him and he couldn't do anything.
His chase music kept playing though.
His chase music kept playing though.
Yikes