Quote Lifetime
You can determine how long a price is valid by setting the cart quote lifetime in the configuration. For example, if a shopper leaves a cart unattended after several days, the quotes price for some items might no longer be the same. By default, the quote lifetime is set to thirty days.
Configure the quote lifetime
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On the Admin sidebar, go to Stores > Settings > Configuration.
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In the left panel, expand Sales and choose Checkout.
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Expand
the Shopping Cart section.
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If the setting is for a specific store view, choose the store view where the configuration applies.
When prompted, click OK to continue.
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For Quote Lifetime (days), enter the number of days that a quoted price remains valid.
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Click Save Config.