Hi @mitxelmo,
Welcome to the Community! This is a great question.
As you correctly pointed out, the Magento 2 periodic sync does fire about every 30 minutes (reference: How often integrations sync reference)
It seems this was also a topic of conversation in this thread previously:
It looks like there was a feature request submitted, but no update has been provided yet as to when we can expect this functionality to be added.
For now, it appears that we are unable to adjust the sync window.
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Hope this helps!
-- Ashley Ismailovski
Ashley Ismailovski, Klaviyo Champion & Director of Email Marketing at SmartSites https://www.smartsites.com/