How long does the Remote charge typically last?

Typically several months for the silver remote, and around 2 or 3 for the Siri remote, though that can vary based on usage.

You can always check battery charge of the Siri remote on the Apple Tv:

Charge your Siri Remote or Apple TV Remote - Apple Support

How to replace the battery in your Apple Remote - Apple Support

Hi. Several months. Depends on the level of use obviously.

You can monitor it in Settings > Remotes and Devices > Remote. If you check it once in a while, you'll get an idea of your usage rate.

You're welcome.