To plan a gaming setup in limited space, start with a desk about 100 to 120...

https://shed-wiki.win/index.php/Why_Desk_Depth_Matters_More_Than_Width_for_Gaming

To plan a gaming setup in limited space, start with a desk about 100 to 120 centimetres wide to fit your monitor and accessories comfortably. Use a monitor arm to free up desk space and give you flexible screen positioning