I had very long hair a couple of years ago, but living in Spain (especially during the summer when i was swimming every day) meant that maintaining it was a nightmare.
I got it cut off, to just a couple of inches past my shoulders and i have to say that i do regret it now. All i'm forever trying to do is re-grow my hair, but it is nowhere near as long as it used to be...
Think about it, because the chances of it growing back to the same length are very unlikely.