Small city 1hr drive west of Tbilisi, with historical sights.
Georgia’s 5th populous city, but still only 50,000 population. This town is not particularly interesting whatsoever. People usually come here as part of the tour to see the Gori Fortress, Stalin Museum, and Uplistsikhe ancient cave city. I would recommend only the Stalin Museum and cave city. Gori Fortress only if you got extra time.
3-4 hours, or half day, should cover all of those. Or a day tour if you’re coming from Tbilisi.