One doesn't drink the peasant ale at the 12 hour, heaven forbid.
A Pims and soda is the preferred quaff.
For the Bathurst 1000 you are allowed to take one case (24 cans) of beer in with you each of the four days it is on. Personally I would struggle to drink 24 cans over the four days let alone a case each day.
LOTS of people do it though!