This is, if not normal, something you should not worry about. Found this in a newsgroup

If it hangs at “13 minutes remaining”, this is expected.  Leave it be for
about 20-30 minutes and it should move past this phase.  At this point in
setup, we lay down several Windows Server 2003 hotfixes, which takes a
little bit.
If it takes over an hour or so before moving off of 13 minutes, let us know.

David Jones
SBS Product Team