well the period of letting go is really depends on emotional background of the person, the attachment to his/her ex and how willing is him/her to change himself/herself.

Because of this differences, you can't just simply go to particular person and say "you are a loser, move on already. I did the same, why don't you?" or something like that because s/he is differ than you.

I've been through the same experiences until now. And because I have certain personality disorder, it's harder to let go than normal people. Some people just simply say just find another girl etc when in fact people don't even know your emotional background. But because of willingness to change, I still struggling to find myself and recover from this.

What can I say is, for some people who can't let go, just find yourself deeper and create self-worth. Once you find and know yourself, you will see your ex as imperfect and not more than normal people. You might have obsessive thought, just learn how to switch the thought into something else.

and remember, you are starting from scratch again. So, don't try to look back and whining over the past. You just flipped a page of bad ending and currently writing the new one.
Take the lessons from previous relationship and learn how to make it better in the future.