Posting because Yahoo notes US markets close in 3 hours
11/23/2007
The NYSE trading floor will close at 1:00 p.m. on November 23, 2007, the day after the Thanksgiving holiday.
Crossing Session I order entry will begin at 1:15 p.m. with order executions at 1:30, and Crossing Sessions II, III and IV orders will be accepted beginning at 1:00 p.m. for continuous executions until 1:30 p.m. on these dates.