How frequently does Google fetch sitemaps?
I am now working with a high traffic website that normally has 30 new posts per minute. It currently it provides a sitemap which only includes the 100 newest posts (3 minutes).
Is this method is enough? Do bots fetch sitemaps every 3 minutes?
Does the site need sitemaps to list all 5M posts? How would providing these sitemaps change traffic and PageRank?
Will Googlebot remove URLs that were previously listed in sitemaps but now are not?