The back-to-back episode of 24 this year is scheduled for Monday April 5th, 2010 (8:00PM-10:00PM). Typically these have occurred earlier around the mid-season point, but this one will be a few episodes later.
Cherry Jones said last month that episodes 15, 16, and 17 “are three of the most exciting [episodes] of the entire eight years of 24. I couldn’t catch my breath reading them, they were just thrilling. I didn’t know how I was going to wait until I got the next script to see what happened!”
The 24 Season 8 finale (also a two-hour event as usual) is scheduled for May 24th, 2010 (8:00PM-10:00PM). Note how it’s listed as a “season” finale and not a series finale, so let’s hope that is a good sign.
Source: The Futon Critic