Hi
Firstly it is important to state what the Israelis and Americans are doing is NOT to degrade the Iranian Nuclear program, it is to carry out a forced regieme change.
But since you asked the question allow me to help
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As you can see from the above timeline which I have created sorry its a little long xD... Iran has worked really hard to develop its nuclear program which is largely peaceful but you will seen that it has taken 10 years for Iran to spin enough centrifuges to get its 20% enriched uranium to 60% uranium. For reference 90% purity enriched Uranium is what is required for the development of nuclear weapons.
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What the Israelis are trying to do by targeting Iranian nuclear sites is to destroy those centrifuges that purify Iran's uranium, doing so will set Iran's nuclear program back decades.
Iran's current Enrichment stockpiles:
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How long would it take for Iran to develop a weapon (IN THEORY)
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Note: Data is from the latest International Atomic Energy Agency monitoring report for each each year and is current as of May 17, 2025. Values represent production of enriched uranium material. Building a nuclear weapon would require more time before it was viable.
Source: International Atomic Energy Agency, Wisconsin Project on Nuclear Arms Control's Iran Watch, Institute for Science and International Security