Just to add, in Brazil we usually have 1l cartoons of UHT milk or 1l bags of pasteurized milk.
Pasteurized milk goes bad in 3 days or so, and many people can't run through the entire 1l in that time. UHT milk will last for a good 2 weeks after opened, so I guess that's the kind you buy.
"Sorry, 100 billion!"
He needs to up his number.