If you have access to Google Earth, you can use the 'Path' tab using the Ruler tool to make some measurements your self.
Of course the first step is finding Pop Century. One way to do this is to click on the menu commands "Add \ Placemarks...". Copy and paste the following coordinates:
Latitude: 28°20'59.72"N
Longitude: 81°32'36.78"W
Click 'OK'.
You should now have a pushpin on Generation Gap Bridge that you can zoom in on.
I did a couple of measurments myself testing the distance from the farthest room from the elevators to the center of the bus stop. Here's my worst case results:
Building 6 - 0.23 miles
Building 7 - 0.22 miles
Building 4 or 5 - 0.20 miles
Building 2 - 0.28 miles
On the flip side, the closes you can get to the bus stops is to have a ground floor room at the end of one of the 60's buildings closest to Classic Hall., that requires a walk of only 0.13 miles.
That makes for an 800 foot difference (less than the length of a football field) between the worst and the best.