I have heard similar estimates. I think what is important: It is less than one year. That is pretty quick from the view of regional geopolitics.
Here is a quote that I found from abc.net.au via Google:
> According to the US Institute for Science and International Security, "Iran can convert its current stock of 60 per cent enriched uranium into 233kg of weapon-grade uranium in three weeks at the Fordow plant", which it said would be enough for nine nuclear weapons.
Putting on my black hat for moment: I think Iran's strategy to tip toe up to the line of weapons grade uranium is strategic genius. (Of course, I don't want them to have nuclear weapons!) It provides maximum deniability so they can get as many parts as close as possible before the final 12 months dash to get nuclear weapons.
