Installation of OS X Mountain Lion does not move on even though it says o second remaining. It has been taking at least 4 hours. Help!!!!!

I wanted to restore my Mac before I give it out to my brother. After cleaning it, I have been trying to reinstall the OS X Mountain Lion but it does not work; it just takes forever. It is so frustrating that the installation stops when it says "about 0 seconds remaining." Help please!

Restart while holding down the Command + R keys so you can verify and if necessary, repair the startup disk.
Apple - Support - OS X Mountain Lion - Installation and Recovery

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