Untill FO4. Then when i'm bored with that i'll play Skyrim again untill the next TES. But I won't buy FO4 at launch thats for sure. I mean I played OB for 4 years (still play it) and they said OB would contain what 200 hours of gameplay? And I have almost 300 squezed into it. And they say Skyrim will contain 300 Hours of Gameplay so.... Yeah... Nuff said.
Option "Until you get bored" Should be divided into 2 parts One for those who get bored after 75% of MQ Second for those who gets bored after 8 years and extensive modding
Since i'm a console gamer, until i'm bored. this will probably last me like 4 months. 3 months of all quests, then another month of doing stupid things. Then DLC later on i'll pop Skyrim in the tray. 2 or 3 years later, i will start the Skyrim cycle all over
Until you get bored is a fairly arbitrary thing, some people might play the MQ and then get bored because there is no story, others (like myself) will wind up playing for years off and on.