A Transition from opaque universe to release of CMB

Bill McKeeman
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What is known about how long it took to transition from an opaque universe to the release of the cosmic microwave background?
 
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The usual publications about the CMB cover that, chances are good tons of websites will also mention it. The CMB light we see mainly comes from a period of ~20,000 years, about 380,000 years after the big bang.
 

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