Current approval rating as of Nov. 19 (according to the Nate Silver website) is 41.5%. I will resolve in a binary fashion (a .1% change will resolve the same as a 10% change). If the rating is exactly 41.5%, I will resolve N/A. I will resolve based on the January 31 percentage.
https://www.natesilver.net/p/trump-approval-ratings-nate-silver-bulletin

Context: With the Epstein Files Transparency Act being passed today, Trump has 10 days to sign (or veto) the act, meaning that his decision will be made by Dec. 1. If it is passed, the DoJ then has 30 days to release the files, to the extent possible.

Assuming that the document release goes forward, then public opinion about the files will likely be somewhat settled by the end of January. It is obviously a tenuous assumption that 1) the Epstein files will be fully released in this time period, and 2) there will be no more large news stories before the end of January, but that's part of the risk you'll have to take :)

I will not vote in this market. If there are any questions, please put them in the comments!