Sevens.

[justcarol67]

No: HPFGUIDX 161693

Geoff wrote:
> >So what do we deduce from that?> [Hogwarts has seven years just
like UK schools]
> 
> Ken says:  
> Well, perhaps that we have been introduced to the location of a 
> horcrux and the object it is within in every book?

Carol says:
An interesting idea if we count the first "Horcrux" we're introduced
to as Voldemort himself. (There are seven soul bits but only six
Horcruxes, assuming that they've all been created.} So SS/PS
introduces Voldemort, CoS gives us a Hogwarts Horcrux, GoF introduces
Nagini, but HBP introduces two locations, the Gaunt hovel and the
cave. That leaves three locations for the other four books. A good
thought, but it doesn't quite work out (unless we don't get any new
locations in Book 7).

So what other locations do we associate with Voldemort? I very much
doubt that there's a Horcrux at Godric's Hollow, which he would
associate with his defeat, and I can't think of any new Voldie
locations introduced in OoP. (The locket Horcrux will be probably be
in 12 GP, not a location associated with Voldie, who hid it or had
Bella hide it in the cave.) And the Riddle House, introduced in GoF,
probably hides Nagini.

Carol, not sure if she's contributed anything to the discussion but
pretty sure that Harry has already visited all the Horcrux locations