There is this page for beat times, interesting in some way.
There is also branching thing. Branching quests are cool since allow to play our way, but may result in perception of shorter gametime. Like Witcher 2 having significant different act 2, or Tyranny. In PoE that is Rodrick stronghold, which was nice quest, we could aproach it in different ways, but at once experience only 1 path.
Extreme example are grand strategies like civilization or europa universalis which is more or less are the same game, but if you like it you may sink in for many hours.
There is also question how much gameplay game support, most activities in game may become boring. This is big plus for big games, that if we develop versalite gameplay we may as well make game potencially longer and slap bigger price tag on it.
There may be Bioware trauma, making KoToR MMO and Dragon Age Inqusition similar to MMO (or Assasins Creed) which was disappointing. Less roleplaying for rpg fans to enjoy, and Dragon Age gameplay isnt that interesting (Mass Effect gameplay is more responsive if you are into power shooters).
Bethesda probably have good idea of making main quest shorter (if you care about it) but having large potencial of exploration. Witcher 3 on the other hand is more 50:50 but at some point player may be borred with sailing over Skellige, escorting Dwarves, or going with another Sorceress into cave.
Edited by evilcat, 20 January 2017 - 04:03 AM.