What is Iran's current breakout time?

Natural uranium has only 0.7 percent of the isotope U-235, and the effort required to enrich it to one SQ of WGU is about 5,000 Separative Work Units (SWUs). Iran currently has about 9,000 functioning first-generation IR-1 centrifuges, with another 9,000 not in operation. The IR-1s installed in the Natanz and Fordow facilities have been performing at an average per unit rate of 0.75 to 1 SWU per year. Using the 1 SWU/year performance of the latest IR-1 model, the breakout time with 9,000 machines using a natural uranium feed would be six to seven months. However, Iran also has substantial stocks of 3.5 percent enriched uranium hexafluoride (UF6) that can be used as an alternative feed, shrinking the breakout time to three months.

If Iran brought online its other nearly 9,000 IR-1s, breakout time would be about three months with natural uranium feedstock and four to six weeks with 3.5 percent UF6 feedstock. Iran has also developed the more advanced IR-2m centrifuge, rated at 5 SWU/year. If the 1,000 IR-2ms installed at Natanz were used in conjunction with all 18,000 IR-1s, the respective breakout times would be cut by a third.

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See full text at The Washington Institute for Near East Policy: http://www.washingtoninstitute.org/policy-analysis/view/irans-nuclear-breakout-time-a-fact-sheet