How long can a folder name be?

I just replaced a folder with a less important one with the same name on my Mac OSX. How can I undo this?

• I can't believe what a moron I did. I just replaced an 86 song "Unknown Artist" folder in my iTunes Music folder with a far less important one with three songs in it. I accidentally hit OK on "Do you want to replace with [this] with [that]?" What can I do to undo this? Geez, I'm freakin' out. 8^{

• Answer:

  Not much - the files of the same name in the old folder were replaced. They no longer exist.