How long was eventually?
Never measured it but it was fairly long..
Of course this doesn't mean it's not a bug, it seems that something overrides the waypoint orders..
But in the first test, my firing in front of them and they being unable to find any enemy nearby, they simply never moved and this was tested in both 1.05 and 1.07 beta.
I can confirm this on the 1.05 part as well.
But, it happened quite rarely, I would say once or twice out of like 50..
EDIT:
Ok, just tested the time it took the group to return to "safe" (in a situation discussed) and it took approx. 3 minutes..
Until that the group followed it's waypoints but in combat or aware mode (didn't test which, probably aware because they didn't crawl or go prone constantly)..