It's likely something at your end depending on your connection or maybe steam's servers are quite busy.
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The story mode of the game will only take you about five to nine hours to complete. If you meant to ask how long it will take to unlock all of the multiplayer components, then the answer varies from player to player. This could take months to accomplish.
you do something
You should be able tto download it as soon as you've paid for it.
In multiplayer mode under special battle, it has a mode where you can take pics.
it took them roughly about 6 months :)