Pending just means your e-filed return is on its way and that the government hasn't accepted or rejected it yet.
What do you mean it's on the way? It was efiled. Efiled means it's sent electronically to the IRS. They have it somewhere... So there is no "it's on it's way". It's already there.
How long does it take to be approved? 48hrs? Why would it not be accepted within 48hrs? What are the EXCEPTIONS?????????????????????????????
