Why US Israel Attacked Iran 2026 War Duration Estimates

Published: March 31, 2026. The English Chronicle Desk.

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The global landscape was irrevocably altered on February 28, 2026, when the United States and Israel launched Operation Epic Fury, a massive, coordinated aerial campaign against the Islamic Republic of Iran. In the 31 days since the first missiles struck Tehran, the conflict has evolved from a “surgical” decapitation strike into a multi-front regional war that has shuttered the Strait of Hormuz and pushed global oil prices to a volatile $116 per barrel. As the “Islamabad Initiative” struggles to find a diplomatic off-ramp, military analysts and historians are beginning to piece together the exact triggers that led the world’s most powerful air forces to gamble on a direct confrontation with a nation of 90 million people.

The “Why”: Three Triggers for War

According to declassified briefings and statements from the Trump administration and the Israeli Ministry of Defense, the decision to attack was driven by a “perfect storm” of failed diplomacy and perceived existential threats:

The Nuclear “Red Line” Crossing: Following the final collapse of indirect Omani-led negotiations in early February, Western intelligence reportedly confirmed that Iran had begun the final “cold testing” of a nuclear trigger at a hardened site near Isfahan. President Trump, stating he was “not thrilled” with the proposed concessions, argued that military action was the only way to prevent a nuclear-armed Tehran.
The Decapitation Opportunity: The timing was dictated by high-level intelligence regarding the whereabouts of Supreme Leader Ayatollah Ali Khamenei. The first wave of strikes on February 28 successfully targeted a leadership compound, killing Khamenei and dozens of top IRGC commanders before they could relocate to deep-mountain bunkers.
Exploiting Internal Weakness: Washington and Jerusalem calculated that the Iranian regime was at its lowest ebb in decades. Following a winter of hyper-inflation and massive “Infrastructure Protests” in early 2026, the U.S. believed that a “shock and awe” campaign would trigger a popular uprising and the eventual collapse of the clerical system—an objective President Trump explicitly called “Regime Change.“

The “How Long”: Forecasts for a Lingering Conflict

While the U.S. established air superiority over western Iran within the first 24 hours, the “quick collapse” predicted by some hawks has not materialized. Experts are now converging on three potential timelines for the war’s duration:

The “Short Slog” (2–3 Months): Oxford Economics and Alpine Macro currently forecast a conflict lasting until late April or May 2026. This scenario assumes that the “Islamabad Initiative” succeeds in brokering a limited ceasefire that allows the Strait of Hormuz to reopen to at least 50% capacity by June.
The “Slow Burn” (Rest of 2026): If the new Iranian leadership—led by Khamenei’s son and a council of hardline generals—successfully transitions to an asymmetric, “Fortress Iran” defensive strategy, the war could settle into a prolonged campaign of attrition. This would involve continued drone strikes on Gulf infrastructure and a “guerrilla” naval war in the Persian Gulf.
The “Decade of Chaos”: RAND Corporation experts warn that if the central Iranian state collapses without a clear successor, the resulting power vacuum could mirror the Libyan or Syrian civil wars, leading to a decade of localized conflict and “proxy battles” involving Turkey, Russia, and the GCC.

As of today, March 31, the conflict remains in a state of “violent equilibrium.” The U.S. and Israel continue to strike missile production sites, while Iran—despite the loss of its Supreme Leader—has demonstrated a resilient ability to strike back at regional water and power plants. With oil at $116 and the “Islamabad Initiative” as the only viable diplomatic bridge, the world is holding its breath. The war that was meant to “end the threat” has instead opened a new, unpredictable chapter in Middle Eastern history, where the only certainty is that the pre-war “Status Quo” is gone forever.

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