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That is the original expression (not 'two'), and the specific nuclear reaction takes 30 nanoseconds. Certainly not a crisis, but it shuold be right. Kdq (talk) 05:11, 30 October 2010 (UTC)
I don't think so. The historical article cites teh expression as two exclusively. And the generation time is, I believe, pretty much 10 nanoseconds. I've never heard of any other value. SkoreKeep (talk) 01:49, 27 August 2015 (UTC)