This assumes Iran is maintaining consistent stockpiles and still has the capability of large attacks, including their fancier missiles which can avoid SAM systems. It's been well reported the number of drones/missiles Iran fired has consistently decreased. Israel and the US destroyed most of their missile factories so Iran is going to be conservative with how they use them.

At the peak Iran fired 650 missiles at Israel and only killed 28 people, mostly from hitting a single residential building. These days Iran is only firing small salvos into gulf states and only 20-30 drones at a time. I'd be surprised if they could pull off 2025 numbers when they fired a hundred at Israel.

Iran has been getting consistent impacts on US bases in Jordan essentially every day for the past few weeks, and they are well defended.

At the end of the day Iran has more missiles than the US has interceptors. So when you get to the point when you're talking about running out, they just don't need to launch big salvos anymore.