User blog comment:Darkcloud1111/''The Mark of Athena'' Plot Holes/@comment-153.107.33.151-20121010023019/@comment-3146930-20121010205843

Actually SoZ, he vanished only a few days before Jason arrived at Camp Half-Blood in mid-December (as Annabeth said she had been searching for three days, six hours, and about twelve minutes). Then Percy arrived at Camp Jupiter in late June (a few days before June 24th). There is no way he was gone for 8 months, it doesn't add up