21:50 I might be too late with this but while in Atlanta you have to hit Ponce City Market and the Beltline. If possible rent a scooter or e-bike and tour the East Belt line from Ponce City Market all the way up to the Krog Street District. That's where everybody in Atlanta hangs out in case you are wondering. Also, The World of Coca Cola museum is literally right behind you (Atlanta is the birthplace of Coke and home of Coca Cola Co.) And the Georgia Aquarium is also right there behind you and it's a very nice aquarium. The largest in the Western Hemisphere, I think.