>

It’s possible, if you lived for a year or two in a 15-20m population city then moved on to a different massive population city in the you’d probably be pushing towards having walked past a few million people after a decade or so
80 million people would have to be a lifetime of it though
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It's a damn good thing too because there are eight billion of us and we only live two or three billion seconds. >

Probably less than .01% even counting people we just nod at as we walk by.