Can you buy 30 days game TIME in WoW?

Can you please clarify for me if it's possible to purchase a 30-day game time subscription for World of Warcraft? I'm interested in extending my gameplay experience but I'm unsure if the game offers such a specific time frame for subscription purchases. Is there a way to directly buy a 30-day subscription, or do I need to consider alternative options such as purchasing multiple shorter subscriptions or using in-game currency to convert to game time? I'd appreciate any guidance you can provide on this matter.