http://www.bloomberg.com/politics/graphics/2016-nuclear-weapon-launch/
Here’s the entire sequence of events for nuclear war.
Time referred to here is “about 5 minutes” for ground-based and 15 minutes for submarines.
Doesn’t look very secret as it’s all there.
Those are media reports and are speculation.
Hillary was revealing inside information as an argument as to how knowledgeable she was.