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

https://shed-wiki.win/index.php/Is_a_27-Inch_Monitor_Too_Big_for_a_Shallow_Desk%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