How long will Amnesia be?

[Young handsome guy]

There are a lot of attributes necessary for a decent game, length is one (But clearly varies from player to player), replay value however, can multiply the length, it is important in games to have multiple decisions and often good to have at least two different endings, but even an alternative dialog with an NPC is enough to cause players to go through the game again.

To enjoy a shorter game more, you can save every couple of levels and play again later instead of going through the whole thing as fast as possible your first or second time running the game.