Depends how many interceptors they have and how many interceptors they spend per missiles.
Some videos they are launching 6+ interceptors. That’s not sustainable and can’t be used on 200 missiles that’s over 1200 interceptors. Zero chance they have that many. I’d guess in low hundreds maximum.
Iron dome can be replenished and the interceptor is cheap (25-75K). It’s basically an artillery shell with a small booster attached to it and a guidance seeker.
Hamas fired 5000+ rockets in a week and couldn’t deplete the reserves. The old Hezbollah could, but it’s been weakened a lot since 2024
You don't need to deplete the reserves because they aren't going to deploy them all. They will commence on a ground invasion instead + carpet bomb enemy territory to disable launching capacity.
Hamas did successfully overwhelm Iron Dome layered defense in both May 2021 and October 2023 conflicts until Gaza was rapidly carpet bombed and Israeli forces invaded two days later. There's plenty of rockets in Gaza there wasn't a chance to deploy them.
The purpose of iron Dome is to decrease costs. They will not dip through reserves except to protect Tel Aviv area. Other areas they will just allow smaller shorter range rockets to go through while commencing on a ground invasion. The cost goes up at that point and Iron Dome served its purpose to decrease cost.
Hezbollah has capacity to do same 100 rocket barrage on northern areas in Israel on daily basis. It guarantees 20% of rockets get through if not more. Because the iron Dome is spread out evenly across country except in Tel Aviv + critical infrastructure and military bases.
The reason Hezbollah doesn't do it every night is because Israel targets Lebanese civilians in response and threatens to target Lebanese state infrastructure. Because material cost for Israel goes up.
And Israelis want to set precedent that they'll murder civilians or target critical infrastructure in other nation if their material cost goes up.
In future wars with Israel, with any nation or party, they have to have a solution for that Israeli strategy to control escalation dominance.
Hamas did not need to this to this Israeli attempt for escalation dominance which worked in Gaza's favor many times despite being risky as Israel commenced on two ground invasions of Gaza in 2008 and 2014, then didn't after that. It worked well up to 2023. That's the strategy Hezbollah seems to be slowly adopting. All Hezbollah needs to do is not carry out Toofan Al-Aqsa like military reprisal.
However Israel is playing a card of targeting Lebanese government infrastructure and Hezbollah wants to keep Lebanese government happy, which is why they've had to constrain themselves a bit as opposed to Hamas which was the government in Gaza and was under attack anyway so it didn't matter