I know you want a number but there is too much to take into account for me and alot of others out there to put a number on how much ammo on hand is enough. A natural disaster , civil unrest, Terrorist attack, Federal Govt banning ect. This day and age anything is possible and probable...
I don't believe NK will do anything other than talk the talk. But if they do you can rest easy. I'm sure the UN will take control of the situation and have it resolved in no time...Uhhh Disregard last.
I would like to see all schools have qualified armed security. Once they do the cowards looking to make a name for themselves will find another easier target.