Game time usually may refer to monthly periods of a subscription to access World of Warcraft. There are various methods to purchase game time, but the most simple way is to buy it from the Battle.net Shop or the in-game. Other ways to obtain game time varies from purchasing a Battle.net Gift Card or a 60-Day Pre-Paid Game Card.
Having a subscription or game time allows access to the retail servers up to Battle for Azeroth content (unless Shadowlands is owned), World of Warcraft: Classic and World of Warcraft: Burning Crusade Classic.
On March 25, 2021, Game time options for 30, 90 and 180 days have been removed and replaced with a 60 days option.