We have the global version solved topics auto close hours set on Meta for our categories that have Solved enabled which works in a similar way to the category-specific close solved topic after (n) hours version.
You can likely have a browse and see it in action, but it would add a topic timer to the bottom of the topic (once a Solution had been picked) with the standard text:
I don’t think you can amend that to be Solution-specific without changing it for all other uses of the same timer. 