Google reviews do not update, how to synchronise? Thank you for your help.
Hi @Davide_Tartali welcome to community 
the widget uses a 72-hour cache, so new reviews may appear in your widget with a delay
Why my Google reviews are not being updated
The suggestions already exists and you can vote for it.
Reduce Cache Time
Create daily or weekly “cached” option to improve pagespeed performance
All right, thank you.
Hi there and welcome to the Community, @Davide_Tartali 
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