So I anticipate players either sporadically helping each other or regularly attacking each other. At night time, the monsters are going to be an issue, so players will have to work out how to deal with them.
The other big choice for players will be whether they stay in the PvP area and keep hunting, with the risk they will die and lose everything, or whether they will walk back to the bunker, go home to get rid of everything in their inventory, then return to the bunker and start hunting again. Remember that you can build structures within the PvP area, so you can fortify yourself at night-time.
The plan is to play it for at least one hour but depending on how things go, I might let it go longer. I have included the gravel in the chests as a way that people can record which chests they have found, even if others have got to them first. That is why I ask people not to touch the gravel. If you need dirt or stone for construction, there is plenty you can mine.