I'm getting close to having 45 mins done (43 min 52 sec actually). 45 minutes is a good milestone, although it's in the no man's land of film: too long to be considered a 'short' at film festivals, too short to be considered a feature. It's the space occupied by broadcast tv shows, which usually clock in at about 45 - 50 mins with ads to pad out the rest of the time (or more accurately, the show is used to fill the gaps inbetween the ads...)
The final film will be over 60 mins long, so this means I'm 3/4 of the way done.
I guess i better get working on the last part of the script then, eh? ;)