The minimum non-negotiable "breakout window" for 2015 nuclear negotiations of the EU, the U.S. and other nations with Iran, is a period of 12 months. The term "breakout window" refers to the period in which Iran decides to breakout of a signed nuclear agreement and rushes to develop nuclear weapons. It should take at least 12 months for Iran to be able to develop a weapon so that there is time to develop an effective response to the threat to world peace.