The character limit on the Account Name field is actually 255 characters, not the standard 80 found on custom objects. This is not stated in the UI, but can be found in documentation
Just remember that if you use workflow to populate any custom object name fields with the Account Name, that any account with more than 80 characters will break your workflow! (I say this, because I’ve done it.)
So if this question appears on your Salesforce Certification exam, you will now know the answer! And knowing is… well, you know.