If you want to experience the game without immediate payment or at a low cost:
Approximately 10 hours for the main story and 18 hours for 100% completion. Destroy All Humans! on Steam destroy-all-humans-download-pc-game-full-version-free
Ensure your PC meets these minimum specs before purchasing or downloading the demo: Windows 7, 8, or 10 (64-bit) If you want to experience the game without