A 48x24-inch desk gives you enough space for your keyboard, mouse, and a...

https://daisydustmaid.com/how-do-i-draw-a-simple-floor-plan-for-my-desk-and-chair/

A 48x24-inch desk gives you enough space for your keyboard, mouse, and a 27-inch monitor without feeling cramped. Pair that with at least 36 inches of clearance behind your chair to move comfortably during those long gaming sessions