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The default WPSSO_CACHE_REFRESH_MAX_TIME constant is defined to 1800 seconds by default (30 mins), which should be plenty to complete the cache refresh. If you have a smaller site (by number of pages, terms, and users), you could try defining WPSSO_CACHE_REFRESH_MAX_TIME to 900 in your wp-config.php file.
I don’t know why your hosting provider would prevent adjusting / using https://www.php.net/manual/en/function.set-time-limit.php – it might be worth asking them.
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