How long to get over a breakup?

How long does it take to get over a breakup if you have been with a girl for about a year?

Say I was to throw away everything I got from her, delete everything I have of her on my phone/laptop and never see her again. How long would it take to fully recover and be 'normal' again?

How do people manage to get over the 'alone' feeling that they get when they are not in a relationship and that though at the back of your head telling you, you will not find anyone again?

Please don't suggest a rebound or drinking till I pass out, thanks.
How long to get over a breakup?
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