Can a long-distance relationship last for 4 years or more?

Also ....I have one more thing of which I wondered whether I might be allowed to ask you about:
Hi I need some advice.
The Guy my older sister loves will just be coming back from his University….by the time she is only just LEAVING college to start her University. How can they stay together? Do long-distance relationships work? If so….can they work for FOUR YEARS (or more!!!!!) What is involved in a long-distance relationship? How do the two people keep the relationship going? PLEASE can anyone out there offer me any advice via email??PLEASE HELP!!!!!!!!!!!!!!!!!!can you offer me any advice as my sister seems very upset and I don't know how to help her. :(

It can work if they love each other. They can mail, make telephone calls and visit each other when possible.

Letter from a reader: Well there are so many ways to work a Long Distance Relationship...COMMUNICATION is the best way to do...Good thing we have INTERNET these days..you can see and to talk to each other even if your thousand miles away from each other..Snail mail will do, try to write him/her a letter and spray your perfume to the paper or envelope, so he/she can remember the scent of your perfume.