Every game you play there is typically a clear goal of some kind and at the end of that goal is a credits sequence. Games, by nature, are meant to be completed. How long it takes to beat them can vary. Some are as quick as eight hours, while there are a few rare games that can be 100 hours long. It typically depends on the kind of game it is and what the developers are trying to get out of it. Usually, 100 hours is the apex of game length. Anything longer and major fatigue sets in, if it hasn’t already.