Gravity Bleed

[s4dustin]

So the car is up in the air, I have hoses from the bleeder to water bottles to drain. Opened everything up and I have some fluid coming out. How long should I leave all this open? I am running a full wilwood disc brake set up, 13in 6 piston fronts and 12 in 4 piston rears. I cannot seem to get all the air out. I had a friend who did this, left it open for a week and then his brakes were perfect. Any suggestion?