6:30PM
From what the talking heads are saying, if they call Virgina early for Obama, then it will be an early night. If they don't, it could be a long night. After 2000, don't expect them to call any states that are close, too early.
It's pretty clear what to look for.
East coast polls close at 7PM EST. Exit poll results should be available within two hours or so or by about 9PM EST. Depending on how comfortable the networks are with the quality of the exit polls, Electoral College projections should be available by then. If Obama takes Virginia, and/or Florida, and/or (maybe) N.Carolina, then you can go to bed figuring that Obama will reach the 270. If he doesn's accomplish the foregoing, then you may want to stay up at least until the CST exit polling data becomes available and is broadcast.
