"My Daiquirí at the Floridita and my Mojito at the Bodeguita" used to say Hemingway. He drank lots of them. During the first seven years in Cuba, he lived in one of the rooms of the Ambos Mundos hotel and was at an equal walking distance of these two bars. A traditional visit of Old Havana, considered as Cultural World Heritage, does not include necessarily a bar tour.
You can have a general idea within an hour, walking between its main four squares: the Cathedral Square, the Arms Square, Saint Francis of Assisi Square and Old Square. But even if you stay ten years, you may be able not to visit all of it.
