In M2E, the Handling/Dispatch time can be configured in the Shipping policy: Dispatch Time.
According to eBay, the maximum handling time is 40 days.
However, there is a list of options that are acceptable for eBay. You can check them here:
So, we recommend using values from this list. The values like 8, 12, and 18 will not be accepted by eBay.
Therefore, if you use the Magento attribute as a source of Dispatch time, please ensure that the attribute is filled with one of the acceptable values.
Otherwise, eBay will return the error like the following during the product update:
8 business day(s) is not a valid Handling Time.
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