I couldn't tell you how long you were gone or even why you decided to leave, but I can say with certainty that even the shadows started asking where you went. The walls wouldn't talk about you but they started whispering all your songs as Sleep settled in. And even though I couldn't give you definitive time frames all of us know without any doubts that you have been gone longer than the universe existed without planets and longer than dinosaurs have been extinct.
We know because your ghost moved in to the study when the walls turned to glass and the waves became nothing more than the memories of a memory.
Oh ***, I couldn't tell you how long it's been since you left, but haven't you been gone more than long enough?