A 48x24 desk offers just enough space for your 27-inch monitor and gaming gear...

https://blast-wiki.win/index.php/Does_a_Monitor_Arm_Really_Save_Space_Compared_to_a_Big_Stand%3F

A 48x24 desk offers just enough space for your 27-inch monitor and gaming gear without feeling cramped. Keeping at least 36 inches clearance behind your chair means easy movement and comfort during long sessions