In a PnP search how long does the crawl take

In an Education tenant using SharePoint online if you add a new mapping into the PnP search because the crawled property was unpopulated how long do you have to wait before it is fully populated?

Copilot chat suggested 30 minutes to 48 hours. At 48 hours and it managed to find about 45 items. I was anticipating about 900 items.

10 hours later it is still showing 45 items. How do I know if it finished the crawl or just abandoned it, whether it is actually still going or it can genuinely only find 45 items.

Thank you.