> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://support.thumbnailtest.com/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# How soon can I know which thumbnail is best?

After each thumbnail has been run for at least one day, you can upload partial stats and see what thumbnail is currently winning.