Transfering Domain

Hey,

I'm currently transfering my website to a new server and I was told by my old host that I just needed to switch my DNS to the ones provided by my new server. I did this and then I was told by my old host that it could take 72 hours for it to propagate. Is this true? And why does it take so long to do?

Thanks!

:// Matt (http://www.harrypotterfun.com)

 

 

 

 

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