When you ask for the the technical answer is 15 GB for a smooth emulated experience. Compared to modern AAA games that eat 100GB+ on your drive, 15GB is relatively tiny.
The installation size of WWE 2K13 on PC is approximately 25 GB. This size includes the game's main files, as well as some additional content, such as soundtrack and commentary. wwe 2k13 pc size
Because it isn't native, the "size" of your hardware matters more than the disk space. You generally need a mid-range CPU (Intel i5 or Ryzen 5 equivalent) to maintain a stable 60 FPS. : Emulators allow you to upscale the game to 4K resolution When you ask for the the technical answer