Seller reviews are sent to Google daily.

​Google requires a minimum of 100 reviews with quality comments from the last 24 months, 3.5 or higher overall rating, and from the same country to populate your Seller Ratings Page. Once you have reached these requirements in Google Seller Ratings, your stars usually show up within 1-2 days.
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Note: it can take up to 4-6 weeks for the initial ratings to display.

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Product reviews are sent to Google weekly.
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Organic

Google requires at least 1 review with a comment to display stars on your product pages.
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Paid

Google requires 50 overall product reviews that do not mention shipping or delivery, along with unique identifiers for each product (GTIN, MPN & Brand, etc).