Yes, it would certainly take awhile, wouldn't it
I swear, sometimes standing on a street corner in Shibuya you feel like the whole population of Calgary or Vancouver is standing around you.
Which probably isn't all that inaccurate... it's definitely an experience. Extreme people watching~
And when you go up to the top of Tokyo Sky Tree, you can take a picture of 10 million people with just one photo, in each direction. Kind of a surreal thought