Bethesda have claimed repeatedly that Far Harbor, the final bit of DLC that they are releasing as part of the first wave of post launch content for Fallout 4, will be the most extensive bit of post launch DLC that they have ever worked on, far more extensive than anything they ever did for Morrowind, Oblivion, Skyrim, or Fallout 3.
Just how extensive? Well, according to WCCFTech, who contacted some people who have gotten the chance to go hands on with the DLC already ahead of its launch later this week, the main story will be about 20 hours long- while that is a pittance to just how long Bethesda games usually last, it is in fact far longer than their other expansions and DLC, and it is definitely longer than most other games that are put out on the market these days.
Fallout 4: Far Harbor will be out on PS4, Xbox One, and PC on May 19.