1200mm wide and 600mm deep would be the minimum recommended size for a gaming desk. Ensuring a good desk size is crucial to avoid compromising your gameplay experience. For gamers, arm and wrist comfort are key as they will be involved in holding a controller or mouse for hours at a time and their movements can either make or break the game.
It's also essential that you have plenty of room in front of you while playing for access to additional buttons on the keyboard, mousepad space, arrangement of controllers, stream decks and peripherals just in case someone drops by mid-game! The "rule" with regards to gaming desk sizing is this--whatever fits your body should fit your gaming desk! The most important aspect of this guideline is that your feet should comfortably reach the floor when sitting upright for the best posture!