After you purchase it it should take from being within a minute to an hour depending on how busy it is.
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Simply press the 'esc' key.
Press the ESC key.
No, though one of the key things about Minecraft is that you learn to teach yourself things... but if all else fails you can check the Minecraft Wiki.
no Yes it is. The server and multiplayer has also always been part of Minecraft. If you bought the Beta version of Minecraft it is still good for the Full Final release of Minecraft.
Hold the "control" key and click.