About not waiting 24 hours, you can trick google by adding a harmless tag to the url.

Example if your url is: https://example.com/example.ics

Delete it and add a new one: https://example.com/example.ics#1

Then for next test, delete it and add: https://example.com/example.ics#2

And so on. Google will treat them as new URL's to fetch, rather than using cached result