Q: How many computers can share the same iTunes account?

Hello cincip,

Thanks for the question, and welcome to Apple Support Communities. The following article provides more information on associating multiple computers with your Apple ID:

iTunes Store: Associating a device or computer to your Apple ID

http://support.apple.com/kb/HT4627

Your Apple ID can have up to 10 devices and computers (combined) associated with it. Each computer must also be authorized using the same Apple ID. Once a device or computer is associated with your Apple ID, you cannot associate that device or computer with another Apple ID for 90 days. You can view which devices or computers are currently associated, remove unused devices or computers, and see how long before they can be associated with a different Apple ID from the Account Information page in iTunes on your computer.

Thanks,

Matt M.