I always wanted to ask this.
So for instance -> I have a facebook campaign with target audience of 30K. I ran the ad for a week with avergae daily budget of $30. It has reach of 9k till now with frequency of 1.73
Here's the image also :

Now I know not all of my 30K is active on facebook, so till when should i keep my ad running for this target audience? When should i end it.
When it stops making you money.