For a few years I drank 24 cans of Pepsi/day, but after having drank 2 liters (c. 5 2/3 cans)/day for the last 30 or so years I'm now down to 3 or 4 cans/day.
I used to drink 24 cans of Mountain Dew a day, back when I worked the late shift in a prepress shop.
Actually got caffeine poisoning that way. Brought in a 24-pack of Mountain Dew and a pound of chocolate-covered espresso beans one evening. Buy, THAT was a miserable experience.