3m 11s playing time, 1917 frames, 7h 39m, ~13s between frames, March 20, 2007
Perhaps it's the nature of pouring concrete, or union jobs, but the middle of this time lapse is pretty boring. Sorry about that. The beginning is fun enough; and the end, with the inch-worm workers and the vacuum-like concrete massager, is cool, too.
Please note the right 1/3 of the image is slightly affected by the reflection of the building façade on the window.