Well your knowledge does depend one how you would document it so the next one who come would continue from where you left, one of the reasons behind assassination of Fakhrizade was cutting link between our knowledge back in 2003 tests and now.Either that, or they learn to live with. They cannot force Iranian to unlearn what they know. Therefore, we will practically always be a zero breakout time nation unless we give it all away which is impossible! As @TheImmortal assessed which I think was very clear thinking, once these IR-9's are into mass production, its practically impossible to de-nuclearize Iran short of invasion!
Therefore either war, or they give up. And if Israel attempts something, Tel Aviv should look no different than Baghdad in March of 2003.
The point ain't IR1 or IR9 but the political decision to push the program forward, these centrifuges just accelerate the process of enrichment.