This article about the completion date of a parking garage is worth reading, if just for the "Yeah, right" factor. The gist is this.
At the local city council meeting the architect of a new garage said the completion time would be about six months. It infers that earlier the date was set at 6-9 months.The city manager then said that "six months sounds better than nine."
Well, yes, but is it realistic. I have absolutely no idea whether or not the garage can be built in six, nine, or even twelve months however my experience with construction, particularly when there is demolition involved, that construction scheduling is an art, and in some cases, a black art.
It will be interesting to follow up with the city of Gainesville about Christmas time and see if that which "sounds better" is in fact reality.