Sources: 

As tensions between the U.S. and Iran escalate,
President Trump warned that the naval blockade may last for months. He conveyed this during a meeting with oil executives, following his rejection of Iran's latest offer to reopen the Strait of Hormuz.
The Pentagon's financial assessments are troubling, as estimates for the Iran conflict's expenses have climbed. Initially touted as merely
$11 billion for the first six days of conflict, recent discussions point to a real cost between
$40-50 billion that accounts for the reconstruction of U.S. military installations.
Trump's concern reflects rising economic strain and the potential for further military action. Pentagon officials, during budget briefings, indicate costs related to war efforts are on the rise, including the damage to overseas installations that is now not reflected in the Pentagon’s
$1.5 trillion budget request for fiscal year 2027.
As stated by the Pentagon, they do not currently have a final number for the damage and have yet to decide if reconstruction is necessary or feasible, indicating uncertainty about future military expenditures.
In light of these developments, it remains crucial for both the Iranian authorities and U.S. officials to navigate potential negotiations carefully to avoid escalating conflicts further.
Sources: 

President Trump indicated that the U.S. naval blockade against Iran may persist for several months following the rejection of a deal to reopen the Strait of Hormuz. Concurrently, Pentagon officials are assessing war costs significantly higher than earlier estimates, potentially reaching $40-50 billion due to infrastructure damage.