1. Initial Review: Once you fix the issues and request validation, Google usually starts the validation process within a few days.
  2. Validation Time: The entire validation process can take from a few days to several weeks. It depends on several factors such as the number of pages affected, the type of error, and how often Google crawls your website.
  3. Crawl Frequency: If your website is crawled frequently by Google, the validation process might be quicker. Websites with higher authority and more frequent updates typically get crawled more often.
  4. Complexity of Issues: Simpler issues might be validated more quickly compared to more complex or widespread problems.
  5. Partial Validation: Google may perform partial validations, where it checks a subset of the pages initially. If those pass, it may proceed to check the rest. This can cause additional delays.

You can monitor the progress of the validation in the Search Console. It provides updates on whether the validation is in progress, successful, or failed.