How many times can you use XP Serial

Hello, I am Wondering How Many times Can you use your Microsoft Windows Xp Serial For your Computer. I keep hearing diffrent awnsers such as 10,20 ECT....
Can Someone Give me the correct awnser to this?
Thanks,
Error

 

The serial should never expire

 

While there may or may not be a specific number of reactivations, there are a couple of sites which provide good info about reactivation:

http://www.pcbuyerbeware.co.uk/ProductActivation.htm

http://www.michaelstevenstech.com/xpfaq.html#06

And this page from MS, an FAQ collection:
http://support.microsoft.com/?kbid=302878

Hope that helps some.

 

As long as Microsoft wants.