That's one strong set of lungs!
If you know any girls who can do that, let me know. :-)
It takes a while, but it's a great way to go. You really get your money's worth. I'll tell ya, it's also hard on the lips. They get all swollen keeping a tight seal on the straw. It helps a bit that the things are so cold. It's rough when the straw collapses, too. Feels like your lungs are going to come up your esophagus.