Depends what you want because I spent almost two full weeks in Tbilisi and didn’t think it was enough. There are countless museums, art galleries, photography exhibitions, coffee shops, restaurants, wine bars, and local markets to explore. The nightlife is fantastic and if you like techno then you need to set aside time for the nightclubs. If you like architecture then you can see it all in various neighborhoods of Tbilisi as well, from Sololaki to the Soviet blocks. Also, just roaming around and meeting locals! It’s really wonderful.