A closure of the Strait of Hormuz would start affecting markets within hours to days , with the major impact usually showing up in 1–2 weeks as oil shipments slow, inventories get drawn down, and shipping insurance and freight costs jump. Reuters reports it can take weeks for shipments to resume even after a disruption ends, while industry analysis says a full closure could create one of the biggest energy supply shocks in decades.

What “major impact” looks like

  • Immediate: crude and LNG prices spike, tanker rates rise, and traders price in risk fast.
  • Days to 1 week: refineries and buyers begin adjusting cargoes and tapping stored supply.
  • 1–2 weeks: the impact becomes broad and visible in fuel prices, petrochemicals, fertilizers, and regional inflation.
  • Longer than that: if the closure persists, shortages and price shock can spread globally, not just in the Gulf.

June 27 context

Recent coverage around the Hormuz crisis says the situation was still being discussed as a live energy-security threat, with talks about reopening and warnings that markets remain underpriced to the risk. Reuters also noted that even if conflict ends, the oil supply shock can keep worsening for weeks because inventories have to cover the gap first.

Practical read

If you’re asking about a June 27th closure scenario , the answer is: the market would react almost immediately, but the full economic pain usually becomes obvious after several days to two weeks. That is the window when shortages, logistics disruptions, and consumer-price effects become harder to ignore.

TL;DR: immediate shock, major impact in about 1–2 weeks , and possible spillover for much longer if the strait stays closed.