SaltyNZ:
As an aside, if I ask the guessing machine how long it takes to sail from the Gulf to Korea, how long it takes to refine a VLCC load of oil, and then how long it takes to sail from Korea to NZ, it tells me somewhere between 40-52 days depending on how fast they sail, allowing 10 days to fully process the crude on the tanker. So that might give us a fortnight of diesel still in the country if a) everything opened up fully today, b) there are a bunch of fully loaded tankers ready to put the pedal to the metal, and c) everyone sails at top speed and the weather is good. And of course every day of delay eats that best case, and I assume that you can't just switch a refinery on like a light switch so if they run out of stuff to process it might take a day or two to prime everything again before they can start pumping out refined products.
Although you're not factoring in the country reserves that are held, (particularly in North Asia),
Japan as an example got absolutely crucified in the 70/80s oil crisis and have had a longterm policy to insulate local oil refiners from similar crude disruptions, and therefore hold around 200 days of crude on shore as a buffer, Korea and China are similar, and I suspect Singapore are also similar ( but the actual extent of holding s there are a state secret )
So yip, the strait being closed is a HUGE problem, but the North Asian refiners are not suddenly going to find they have no feedstocks, in Korea refiners are being allowed to swap/borrow from the strategic reserve and I suspect this will be same for other countries,
eventually when this concludes, these countries will slowly start to refill their reserves,
(although they will likely be on the positive financial side as they will be "selling" reserve to local refiners during the crisis, and later refilling them after the crisis at a lower price)
Things were looking so much more positive on Saturday Morning, but now its all gone back to being a $hit sandwich...

