For additional perspective, you can easily blow through 200+ rounds in one sitting - often under an hour, depending on what kind of drills you are doing. Many of the courses I've taken require a minimum of 300 rounds.

This is part of why "gun people" roll their eyes when the news talks about someone "hoarding thousands of rounds" - it's no where near as much as you might think, and people like to buy ammo when it's on sale (ammo's expensive!).