The 2016 game Doom typically takes about 11½ hours to complete the main story. If you include side content, the playtime extends to around 16½ hours, and for full completionist runs, it can take approximately 27 hours

. Some player reports suggest the campaign can be around 9 to 13 hours depending on how thoroughly you explore secrets and side objectives

. In summary:

• Main story: ~11.5 hours
• Main story + side content: ~16.5 hours
• Completionist (100%): ~27 hours

This makes Doom (2016) a moderately lengthy first-person shooter campaign with additional time for those aiming to fully explore the game