Yeah. Contacts wear out in much the same way a toothbrush does, left alone they'll be fine for ages, it’s the amount of times you wear them that counts.
The corrective kind I wear (and the most common type for coloured lenses) theoretically last for 30 days (or 30 wears), ie putting them on in the morning and taking them out at night. But of course you can wear them for WAY longer than this, that's only the manufacturer's suggestion and they're interested in you buying more sets more often.
You don't need to keep track of exactly how often you've worn them either, you'll know when they've had it - they'll become uncomfortable to wear. With proper care they can last for quite a while.
Be warned though, for the first few days you'll have a hell of a time putting them in and taking them out, once they're in though you shouldn't be a problem. I strongly suggest visiting an optometrist so they can show you how to put them in etc... makes it a lot easier.
They look REALLY cool btw, my friend has some Zombie ones; they're all white so his entire eye is white except for his pupil.
Hope that helps.