I'll have four as well, most likely. Because I can do Itsuki and Tsuruya on the same day, and then there's two days left, nyoro~n! So two days=two cosplays, although at this KumoriCon I changed into another cosplay on Monday, so I suppose I could do that again if I have to.
But for SakuraCon, as I don't stay at a hotel there since it's close to my house, I do a cosplay a day, even on Thursday when I get my badge. =3