What are the differences in WP Fastest Cache cache timeout rules?

Question

caching

If anyone has used or is using the WP Fastest Cache caching plugin, please tell me. What is the difference between the rules when setting the cache timeout:
- once a day;
- once daily;
- everyday.
If it offers three similar options, then there is a difference in something?
I want to configure this plugin so that the cache is cleared gradually over the course of a day as the caching period for each individual page expires, and not all at once. How do these rules work? So far I haven't noticed any difference.