All over the net people are claiming iDVD gives burn times roughly equal to the amount of digital video you're burning. I'm trying to burn a pretty lengthy DVD right now (over an hour), and though I'm over a third of the way in, iDVD is telling me I've got 527 minutes to go. ?!?!!

Welp, that's probably a bit longer than I should expect, but
here's a clue that says perhaps that isn't so crazy (though the time just keeps going up, which isn't cool at all; started at 180 minutes to burn or some such)...

On an 800-MHz iMac G4, iDVD took nearly 2 hours to encode and burn 20 minutes of video. It compresses video in the background while you work, so burn time appears shorter in most situations.