I think a visit should be at least 72 hours. On the first day in a place, people just run around between hotels and airports or check out standardized tourist thingies or the conference center. On the second day, people continue to do the things they do the first day, albeit more tiredly.
But on the third day, one begins to see and feel the place, begins to be able to do unstructured things like taking a four-hour walk, ride the subway to a station with a funny name or follow the advice of a local you met at the pub the evening before. That's the day a visitor really starts to note where he is, and starts to think about not the things he planned to do before the trip or by checking out the hotal brochures but the things he found to be interesting well after arrival.
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But on the third day, one begins to see and feel the place, begins to be able to do unstructured things like taking a four-hour walk, ride the subway to a station with a funny name or follow the advice of a local you met at the pub the evening before. That's the day a visitor really starts to note where he is, and starts to think about not the things he planned to do before the trip or by checking out the hotal brochures but the things he found to be interesting well after arrival.