Hello,
could you please PM me your generator URL and an example URL that is not included in sitemap and how it can be reached starting from homepage?
The crawling time itself depends on the website page generation time mainly, since it crawls the site similar to search engine bots.
For instance, if it it takes 1 second to retrieve every page, then 1000 pages will be crawled in about 16 minutes.
You can use "Exclude URLs"/ "Add directly in sitemap" settings to increase crawling speed.