Finding warranty information can be a PITA.
Your can contact ASRock > Support Request Form online and you can send a private message (PM) to ASRock TSD - Emily and ask her to explain in this thread how long the warranty period is.
I believe that all or most Gigabyte, Asus, and MSI motherboards have a three year parts and labor warranty covering defects. Some boards like the Asus Z77 Sabertooth (about $230) come with a five year warranty.
It's always a good idea to double check the information on a seller's website to verify that they didn't accidentally post incorrect information.