Max time is 120 minutes for single layer (normal) DVDs and twice that
for Dual Layer blanks. Keep in mind this is an estimate and also you
have to include any menu items you add to iDVD in your total time. In
other words, if you add a three minute song to a menu in iDVD, then
your time left for your movie(s) is now about 117 minutes.
Patrick Timlin
http://www.geocities.com/ptimlin/