It depends on your ISP. If you have a static IP it will never change (will it probably will at some point, but most likely it'll remain the same). You most likely have what is called a dynamic IP, how dynamic it is depends on how your ISP works.
I am on dial-up, so mine changes everytime I dial-in. Some ISPs (like AOL) use a proxy farm, so your IP may change every page load. Some cable/dsl users keep an IP for months on end...
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