As an improvement suggestion to pinning some of those ranks - could the title of the item (where appropriate) be made to link directly to the activity in addition to the rank linking to the table?

That is, for example,

Everything Challenge would link to http://www.funtrivia.com/templates/badge219.cfm
Quizzes authored would bring up author central, https://www.funtrivia.com/author/
Question Quest goes to https://www.funtrivia.com/questionpost.cfm

and so on - a direct link to a place where I can work on my rank.

I'll gladly help you compile appropriate links

Yes, the GM Rankings I noticed are updated now. Thank you!

Great idea by Wes about linking the appropriate title in the table to the Challenge etc.

How often will the ranks be updated?

They should automatically update once per day.