How long does it take for Review Markup to show in SERPS?

Selected answers from the Dumb SEO Questions Facebook & G+ community.

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  Neil Cheesman: Our reviews with markup are listed within minutes...
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  Adam Durrant: If correctly marked up following the guidelines and the markup is in your source code about 2 weeks max.
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  Ronnie Lawson-Jones: Some review markup may never show up, its up to google
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  Alan Bleiweiss: Ronnie brings up a VERY important point - just because you have the markup and do everything right, INCLUDING submitting the URL through GSC, the markup may NOT appear in the SERP at all if Google`s overall algorithm system doesn`t find enough trust across other signals to trigger the display.
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  JL Faverio: Grazie.
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  Stockbridge Truslow: Trust. That`s the key word in these replies - and probably should be a key word in most of the replies to most of the questions here. Google needs to trust what you`re saying is true - and it`s got billions of other pages on the web to verify whatever you`re claiming.
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  Lhanz: What is the best basis of a star rating markup? I implemented a star rating markup based on GMB reviews. It did show at first. however, since updating it to match the reviews in GMB, it disappeared in the google serp.