Bittersweetlove.....It has only been 5 months....which is not long enough to complete the grieving process from a relationship that one invested a part of oneself into....
If you insist on a timeframe...lol...it takes about a year. The first year anniversary is usually a time of some angst ...and, after it passes, the whole thing takes on a feeling of past history, rather than acutely painful present experience....
This is based on the assumption that you are working o n your own self and going forth with living your life as fully as you possibly can....AND, it is based on staying no contact....if you re-engage with him, it will set you back, every time....
You are about at the halfway mark, and it should gradually get easier and easier....
The timeframes that I give are purely from my own experience and my observations....