What the HE.. is taking so long?

How long does it take Apple to approve an app to be sold at the store? I am awaiting the release of Lastpass for iPad and it still has not been released yet. I have been told by lastpass support that the iPad version is awaiting approval by Apple. This was a week ago and it appears that the app is still not released/approved.

How long does it take Apple to approve the release of an app?