What is the deadline for returning to Thailand with a multiple entry re-entry visa that expires on November 7, 2024?

but that is not a reply on the question only a explaining the system of re entry

It sounds like you got a multiple entry re-entry permit from immigration at some point during your stay in Thailand. This permit allows you to come back and resume a stay valid until your original visa's allowed stay through date of 7 November. Essentially, it allows you to leave and come back as if you never left, and you still retain the original date of 7 November that you were allowed to stay till.

If instead, you didn't mean that you have a re-entry permit that you paid for within Thailand at immigration, then you might be referring to a multiple entry visa that you got from a Thai consulate outside Thailand before travel. If that multiple entry visa expires 7 November, it means you can come back any time up until that date, and still get stamped in for the full allowed stay period (for example, 60 days for multi entry tourist visas, or 90 days for multi entry Non-B visas).

A re-entry permit does not extend your permission to stay in Thailand. Your existing permission to stay ends on November 7th and that's why your re-entry permit ends on November 7th. If you don't apply for an extension from immigration before then, you lose it.

Most immigration offices accept an application for extension up to 30 days before your stamp expires, and some accept it 45 days before. So go early and apply for your extension. You'll need to purchase a new re-entry permit for your new extension.