sitemaps easily run into the gigabytes for larger sites. I just checked https://www.nytimes.com/sitemaps/www.nytimes.com/sitemap.xml.gz https://www.nytimes.com/

sitemaps easily run into the gigabytes for larger sites. I just checked https://www.nytimes.com/sitemaps/www.nytimes.com/sitemap.xml.gz https://www.nytimes.com/sitemaps/www.nytimes.com/sitemap.xml... and it contains 2000 urls of individual weekly sitemaps of 1 or 2MB each. And that's just part of their sitemap structure.