You'll need to call to find out, but it can take 2-3 business days (note:  weekends excluded).  However, if no contact has been made with your financial institution, chances are the order has not gone through.  
On the 13th of August i ordered an Inspiron 14 7415 and had an email that the order has been received and i would recieve a confirmation email shortly. It has been 3 days and no confirmation or even charge attempt?
Recieved internet receipt but no order number or payment done