50 days and Australia runs out of petrol/diesel
The International Energy Agency (IEA) has revealed that Australia, at best, only holds 50 days worth of liquid petroleum product. If anything were to disrupt shipping lane and/or shipping traffic and the petrol stopped coming, then in 50 days all the pumps would be dry. No petrol! No diesel! No aviation fuel!
Industry would grind to a snail's pace and most flight would stop.
Countries that are IEA members are required to maintain on-shore fuel reserves to cover a minimum of 90 days.
It seems the USA has on-shore stocks for 309 days—almost a year.
The following snippet comes from MSN news (here).
So, if some kind of serious trouble does break out between North Korea and the USA then we should probably expect to run out of fuel a few months later.