There was a young lady named Bright
Whose speed was much faster than light;
She set out one day,
In a relative way,
And returned on the previous night.

—A. R. Buller, 1923

Today a notice from the property manager came through the mail slot in the door to my apartment. It says, in part:

PARTIAL SHUTDOWN OF DRIVEWAY

From Monday, March 24, 2008 until repairs to basement roof concrete slab area is completed, which is anticipated to take plus or minus 1 month.

I'm guessing that the actual time needed to complete the work will be much closer to the high end of the range indicated in the estimate.