Not long at all then.

Samantha Owens:

[the girls pile into bed after having a pillow fight and start jokingly chanting the incantation]
Bloody Mary. [the girls giggle and chuckle and she says it again] Samantha Owens:
Bloody Mary. [the girls giggle again and she says it the last time] Samantha Owens:
Bloody Mary. Martha - Samantha's Friend #1:
[a vision of Bloody Mary appears outside the house and they hear tapping on the window; the girls scream]
Who is it? Samantha Owens:
[sees David enter]
David! Martha - Samantha's Friend #1:
[throws a pillow at him]
Asshole! [David catches it, flips the light on, and sits on the couch] Samantha Owens:
So, David, you're back early. Shouldn't you still be at the dance? I'm sure it's still going on. David Owens:
Oh, yeah well... I was there long enough not to see any of you. Samantha Owens:
Well, we didn't want to go to that stupid popularity contest. David Owens:
And why is that? Oh, 'cause you couldn't get dates? Martha - Samantha's Friend #1:
Yep. That's exactly what happened. The football team put us on the blacklist. Samantha Owens:
We could've gone! We preferred to stay here and have some female bonding. David Owens:
[David looks down Mindy's top and sees her cleavage]
Hey, Mindy. Nice. [David winks] Mindy - Samantha's Friend #2:
[looking disgusted and uncomfortable]
Shut up! Samantha Owens:
[looks shocked and disgusted]
David! David Owens:
[He gets up from the couch and moves towards the girls]
Oh, and just so you guys get it right, Candyman ripped off Bloody Mary in the first place. Not the other way around. [He winks and exits] Mindy - Samantha's Friend #2:
[after David leaves]
How long was your brother outside listening to us? Martha - Samantha's Friend #1:
Long enough to masturbate. Samantha Owens:
Not long at all then. [the girls giggle]