Why Iran war can stretch to 4-5 weeks or longer

In the first time US President Donald Trump spoke since the US launched attacks on Iran on Saturday, he said on Monday the military campaign against Iran was likely to last four to five weeks but stressed that the US was prepared “to go far longer than that” if necessary.

Trump's estimate reflected expectations within military and policy circles that the conflict might unfold in phases rather than conclude in a matter of days. Analysis from various experts explains why a campaign of this kind could last several weeks or even longer.

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Military planning points to a multi-phase campaign

One of the strongest indications that the conflict could extend over weeks comes from US military planning itself. Reuters reported that American commanders were preparing for the possibility of sustained operations rather than a short, symbolic action. Such preparation typically accounts for contingencies, escalation risks, and the time required to achieve defined objectives.

Modern air and missile campaigns proceed in stages. Initial operations often focus on disabling air defenses and surveillance systems. Follow-on strikes may target missile launch sites, command infrastructure, storage facilities, and naval assets. After each round of attacks, military planners assess damage and adjust targeting priorities. These cycles require time for intelligence gathering, verification, and logistical coordination. When targets are dispersed across a large territory, as in the case of Iran, which has rugged mountains, deserts, and a long coastline, compressing the campaign into a few days becomes operationally difficult.

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Broad strategic objectives increase duration

The length of the conflict is also tied to the scope of its goals. Reporting by Reuters and analysis from the Brookings Institution indicate that the campaign is not limited to retaliation. Objectives appear to include degrading missile capabilities, weakening elements of Iran’s Revolutionary Guard, constraining naval operations in the Gulf, and curbing nuclear-related infrastructure.

Each of these goals involves distinct sets of targets and operational challenges. Facilities may be hardened or located underground. Missile systems can be mobile. Naval assets can reposition. Achieving meaningful degradation across several domains is unlikely to occur in a single wave of strikes. The broader the strategic ambition, the longer the timeline tends to be.

Retaliation and escalation dynamics

Even if US officials describe the conflict as limited in scope, Iran retains the capacity to respond with missiles, drones, cyber operations, and proxy forces across the region.

Reuters reporting has pointed to the possibility of spillover beyond Iran’s borders, including activity involving allied militias and regional actors. Each retaliatory step may prompt a counter-response. In such an environment, the conflict evolves into a series of exchanges rather than a contained episode. Managing escalation, measuring responses, and protecting regional assets can prolong the operational timeline.

Absence of a clearly defined political end state

Wars conclude not only when military goals are met but also when political conditions allow for de-escalation. Analysts cited by Chatham House and the Brookings Institution have observed that publicly articulated end states remain somewhat open-ended. Terms such as “restoring deterrence” or “degrading capabilities” leave room for interpretation.

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Without precise benchmarks, leaders may continue operations until they are satisfied that objectives have been achieved. Diplomatic channels, whether direct or indirect, also require time to develop. Negotiation, mediation, and signaling rarely proceed at the pace of military action. This gap between battlefield developments and diplomatic resolution can add weeks to a conflict.

Regional security and alliance considerations

US forces and allied states maintain bases and infrastructure across the Middle East. Protecting these assets requires defensive deployments alongside offensive measures.

If tensions expand geographically, military planners must allocate resources to air defense, naval patrols, and force protection. Even if fighting remains limited in intensity, the need to stabilise multiple theaters can extend operations. Regional dynamics therefore contribute to the likelihood of a campaign lasting several weeks.

Characteristics of contemporary warfare

Think tank analysis from Brookings and Chatham House underlines a broader point about contemporary conflict. Precision strikes and air campaigns often unfold as iterative processes. Intelligence updates, technological countermeasures, and adaptive tactics shape the pace of operations.

Targets that are hardened, concealed, or mobile require repeated assessment, especially in the typical topography of Iran, which has mountains, deserts, and a long coastline. Cyber and electronic operations introduce additional layers that do not produce immediate visible outcomes. These characteristics make quick, decisive conclusions less common in high-intensity but limited wars.

Trump’s estimate that the war could last four to five weeks aligns with assessments reflected in analysis by various experts. Military planning anticipates sustained operations. Strategic objectives are broad and technically demanding. Retaliation risks and regional dynamics complicate efforts to contain escalation. Moreover, political and economic considerations further shape the timeline.

All these factors suggest that a multi-week conflict would not be unusual under current conditions. Duration in such cases arises from the interaction of military ambition, regional complexity, and diplomatic uncertainty rather than from a single decisive event.