Commentary track size

I know it has probably been covered here somewhere, but what would be the average size of an additional AC3 2 ch commentary track for a 2 hour movie? Since DVD2one doesn’t compress the audio, I was trying to get an idea how much space is lost by adding the director’s comments.

Thanks

Benn

Most of the time commentaries have a bitrate of 192kbit/s. For two hours, that’ll be:
192/860120 = 172800kb/1024 = 168.8mb

There’s also a nice tool for that kinda thing: PowerBit

Good tool.