Chang- There's really no way to predict, since there are just *so* many variables. But you can do a few Chevy Suburbans with a pint of polish if you're using the right tool and the right pads. It only takes a few ounces of product for a vehicle unless you're trying to do "too much" for the product/method, which can result in going over and over the same areas (which will use more).
A can of #16 should last the average non-pro many years. I got over 10 years out of the can I used on my father's cars, but I'm a fanatic about thin applications.