Board Thread:Antaeus' Arena: Audience Chamber/@comment-1515612-20161114162352/@comment-28590810-20161123231016

Don't have BoO with me right now, but Percy mentions in THO that nobody has seen Apollo in six months

But yeah, it is speculation

Still, It is canon that they had know each other before BoO, so the time between the meeting and the dating its still longer than Caleo's time.