The main quest of The Elder Scrolls IV: Oblivion typically takes about 20 to 27.5 hours to complete for an average player focusing primarily on the main objectives. Some sources estimate around 27½ hours, while others suggest 20-25 hours depending on difficulty and familiarity with the game world

. It is possible to rush through the main quest much faster-potentially in 4-5 hours-but this would be akin to speedrunning and is not the typical experience

. More casual or first-time players usually spend longer, especially if they engage with side content or explore extensively. In summary:

• Average main quest completion time: approximately 20-27.5 hours
• Speedrun time: as little as 4-5 hours (not typical)
• Full completion with side quests and exploration can extend well beyond this timeframe