how long should I give...

[BigV]

I would not get along with your therapist.

I could bore you with any number of aphorisms, anecdotes, proverbs, etc that all illustrate the value of sadness, the inescapable necessity of that completely human condition, but I won't. If she's helping you, more power to her and to you. But good can come from extended struggle, even painful, sad struggle. I wish you strength, and if strength leads to and end of sadness, then good.