Cache Timeout Rule

you can choose “once a day”. is there no such option?

I have tried the timeout rule “once a day” but it’s not working and automatically clearing cache in 12 hours.

I recommend you to set up a cronjob as below.
https://www.wpfastestcache.com/features/clear-cache-via-url/

Ok, thanks for the help. I have one more issue, can I use cloudflare Cache Everything rule with WP Fastest Cache?

yes, you can use it.

Great, thanks for your valuable support. Could you please recommend compatible settings (most essential) for Cloudflare Cache Everything?

The cloudflare integration of wp fastest cache does it for you automatically.
https://www.wpfastestcache.com/tutorial/wp-fastest-cache-cloudflare/