How long can the US keep its blockade of Iran in place?

The United States says it can sustain a naval blockade of Iran indefinitely, betting that mounting economic pressure will force Tehran to make concessions as ceasefire negotiations remain deadlocked.

According to Al Jazeera, maintaining the pressure could test the endurance of US forces, expose Washington to further regional risks and leave Iran with an important source of leverage: its ability to disrupt traffic through the Strait of Hormuz, one of the world's most important oil shipping routes.

Here are the key issues around the standoff and how long the US strategy could realistically last.

What is the US trying to achieve?

The Trump administration has increasingly focused on economic pressure rather than a direct military offensive, seeking to isolate Iran and restrict its ability to generate revenue through international trade.

Defence Secretary Pete Hegseth has said the US Navy can maintain the blockade by rotating ships in and out of the region, allowing Washington to keep pressure on Iran without relying indefinitely on the same vessels and crews.

Treasury Secretary Scott Bessent has also promised "measures that have never been seen in the history of economic isolation", with the administration seeking to cut Iran off from international commerce and its ports.

The blockade began on 13 April, according to the information provided, and Iran has since lost at least $6 billion in oil revenues. President Donald Trump has pointed to high inflation and difficulties paying Iranian soldiers as signs that the pressure is having an effect.

What makes an indefinite blockade difficult?

The main question is whether the United States can sustain the military and political costs of keeping a large naval force in the region.

Particular attention has focused on the USS Abraham Lincoln, a nuclear-powered aircraft carrier whose deployment has reportedly stretched to a record seven months without a port stop.

Reports have described deteriorating morale and mental health among the roughly 5,000 sailors and Marines aboard the carrier, including allegations of "severe burnout" and suicidal ideation. There have also been reports of water contamination, shortages of basic supplies and unsanitary conditions.

US Central Command has denied reports of deaths or widespread suicidal ideation aboard the carrier, describing the crew as "resilient and resolved".

The dispute has nevertheless created political pressure in Washington. US lawmakers have demanded answers from the Department of Defense, while Senate Minority Leader Chuck Schumer has called for Hegseth's immediate firing over his handling of the situation.

Retired naval officer Harlan Ullman has warned that extended deployments "erode the readiness and capability" of ships. Aircraft carriers require extensive maintenance, some of which can only be carried out during periods in port, making prolonged deployments increasingly difficult as time goes on.

Why does the Strait of Hormuz matter?

Iran's control of the Strait of Hormuz gives Tehran an important counterweight to the US blockade.

The narrow waterway between Iran and Oman is a crucial route for global energy supplies. Iran closed the strait in early March and has refused to reopen it unless Washington lifts the blockade, removes sanctions and unfreezes Iranian assets.

That creates a potential stalemate. The United States can use naval power and economic measures to restrict Iran's exports, while Iran can threaten the flow of energy through a waterway on which global oil markets depend.

Any prolonged disruption could put pressure on oil prices and increase the economic costs of the confrontation far beyond Iran's borders.

Can Iran withstand the economic pressure?

Iran's ability to absorb economic pain is another important factor.

Tehran faces inflation, lost oil revenues and increasing difficulty financing its government and military. But the country's political system may also make its leaders less responsive to economic hardship among the population than an elected government facing regular electoral pressure.

That could allow Iran's leadership to tolerate a degree of economic damage while prioritising the survival of the political system.

Iran can also seek to increase the costs for Washington and its regional partners through asymmetric warfare. Analysts have suggested Tehran could target US naval assets or rely on allied groups such as Yemen's Houthis to disrupt regional energy exports.

Iran has also sought to put pressure on Saudi Arabia, the United Arab Emirates and Qatar by attacking infrastructure, with the aim of encouraging those countries to push Washington towards negotiations.

What could force either side to change course?

For the United States, the biggest constraints are likely to be military readiness, economic consequences and domestic political pressure.

Rotating ships can make an extended naval presence possible, but it does not remove the need for maintenance, logistics and crew recovery. The longer the deployment continues, the greater the pressure on the broader US fleet and the resources needed to sustain operations.

Washington must also consider the consequences of an escalation around the Strait of Hormuz or attacks on US forces and regional infrastructure.

For Iran, the calculation is different. The government must weigh the economic damage from the blockade against the political cost of making concessions. It also has to consider whether keeping Hormuz closed ultimately creates more pressure on Iran than on its adversaries.

So, how long can the blockade last?

There is no clear fixed limit.

The US can maintain a naval presence for a prolonged period by rotating vessels, as Hegseth has argued. But an "indefinite" blockade does not mean that its current level of military pressure can be sustained indefinitely without increasing costs.

The condition of deployed forces, the need for carrier maintenance, the availability of replacement ships and crews, and political support in Washington will all influence how long the strategy can continue.

Iran, meanwhile, has incentives to endure economic pain if it believes time will increase pressure on the United States and its regional partners to negotiate.

That leaves the standoff dependent less on which side can simply wait longer and more on which side concludes that the costs of continuing have become greater than the costs of compromise.