The way I understand it is that you can do runs as long as you have "tags". So make a static that meets once per week, like the old school assault / nyzule isle groups. If all of you have five tags then you can conceivably farm one NM and build you your access. In this way I see it as once-per-week dungeon that is broken into five 15m segments with each segment representing a potential resting / reset point.