Don't forget that the screen image doesn't take any power. Even if the Kindle was completely turned off, it could leave an image on the screen. (Indeed, it ships with such an image.)
It is possible to completely turn of the Kindle, but there's not much point in doing so unless you're going to leave it unused for more than a couple of weeks.
For the Kindle Keyboard, sliding and holding the power switch for 4 seconds turns the kindle off. It's probably the same for the kindle 4.
(And welcome back — I hope you like your new Kindle!)
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