I'm just wondering that in a game?

What would be an average for someone to play a new game. And it was from start to finish or at the least of it. So how long would it be? A few days, a week, or something?
from anywhere like on the ps3 to 4 or the other game systems too.

It totally depends on the game. Some games can be completed in 10 hours or less. Other games such as Skyrim which are open world can be played in 200-1000 hours if you do it properly and games such as Minecraft like one person answered have unlimited playability. Some games can be finished in hours (The Order 1886), while other games can never be finished (Minecraft).

http://arstechnica.com/gaming/2011/04/the-incredible-shrinking-game-the-truth-of-game-length-in-the-modern-industry/

Some games can be finished in hours (The Order 1886), while other games can never be finished (Minecraft).

http://arstechnica.com/gaming/2011/04/the-incredible-shrinking-game-the-truth-of-game-length-in-the-modern-industry/