In case some are unaware of this resource.
The score progression by minute and second is here:
http://stats.rleague.com/afl/stats/games/2009/091520090926.html#prog
Someone might like to add up the time each was ahead and when the score was even.
Thanks for that!
Looks like Saints led for 54 minutes, Cats for 42 and even for 28.
So out of 124 minutes the Saints led for a total of 12 minutes more.