User blog comment:KrspaceT/The Seventh Demigod; Something unexpected?/@comment-110.32.249.166-20110713233334/@comment-3146930-20110714005805

Except Annabeth wanted to help find Percy, not go to Greece. At the latest the two camps will meet during book 3. That leaves 2 books to have a bunch of other stuff happen that could decide the fate of the demigods. Also, just because only 7 demigods will answer the call, the Argo 2 could have any number of crew members