How long does it take for a plane ticket payment to go through?

I pruchased two plane tickets from Southwest about four to five days ago and the payment hasn't gone through yet. The money hadn't been taken out of my bank account yet. I got a ticketless conformation e-mail from the site with a receipt for the pruchase, but how long should it take for the money to go through?|||To be honest, electronic payment should be almost instant, although it's possible your bank has yet to clear the funds from your account, but that they have been allocated.