My house has been taken over by men with hammers and nail guns and drills. There is loud pounding as the existing windows are knocked out of place, and lots and lots of cold drafts as new windows are being carried in the front door. Also perhaps due to the gaping holes in the walls where the old windows were.
And all before 9 am.
Edit 12/11 : The windows are done! They were actually done the same day, in and out in under two hours. Amazingly fast, and the new windows are much less drafty then the old ones, though I still want to put up some 3-M film over them.