if you were meeting someone for the first time and they have not showed up how long should you wait before you leave?

This is a female , not a male date....
Edit: *Its an outing with a female, im not dating anyone...*
It's been 15 minutes. I called and she said she hasn't left home yet because her husband went to the gym after work instead of home to watch the kids. Then she said once he DOES get home, it'll be about 20 minutes before she can get here.

We 'okay'd' this hours ago...
And on top of it all, I have slight social anxiety, and this place is packed. I'm not gonna sit here all lonely for nearly an hour

I'm going home.