Terrariums can last for many years, although the longivity of your terrarium depends almost entirely on how you care for it. See the 'Caring for your Terrarium' section of the website to learn more.
Terrariums are a great alternative to expensive cut flowers and messy indoor pot plants. They last for years and require very little maintenance. In fact, all your terrarium will ask for is the occasional drink and a bit of tanning time in indirect light.