I focus on drinking rather than hording. But to save on shipping costs when placing orders, which mostly occure from specialized vendors, I often find myself at any one point in time heavy in certain areas and light in other areas. I try to work through everything as quick as possible, but I do know some teas have a much shorter time frame than others, and I try to adhere to those time frames. I place about one order each month, and those tend to be Chinese, Korean, Taiwanese, or Japanese based depending on which area I need to replace the most.
That being said, that does not mean that I have not amassed a large quantity of tea. I do work on clearing out what I have but MarshalN recentliy posted a blog post involving a clear rating of a tea is how quickly you use it up once starting it. That being said I have some rather bad teas, that have stuck around for a very long time, while others I work on saving intentionally, some just end up being kept for a long time because I don't want to drink them.