User blog comment:SayuriDarling/The Blood of Olympus Official Discussion/@comment-24055022-20141012235737/@comment-6266020-20141015013659

Also, Percy only had a short amount of time after the Battle of Olympus before he lost all of his memories and wandered around California, and then a few days before he was swept up into the Camp Jupiter thing/sail across the world and stop Gaea. I recognize that there may have been a little bit of time for him to go make sure Calypso was freed, but honestly the guy was busy!