A 2-liter bottle of any kind of soda usually lasts for about a week in my house... pretty long time, eh?
Well that's because there's only 3 people in my family - mom, dad and myself
And my dad was never a fan of soda, and my mom kinda likes it, and I usually try to stay away from it due to the fact that water would be much healthier and would work all the same... so there you have it, we usually have the soda when we're eating fried food and need the carbonation =)