By Howlongtobeat:
Symphony Of The Night: Main Story: 8½h, Completionist 17h.
Circle Of The Moon: Main Story 10h, Completionist 18h.
Harmony Of Dissonance: Main Story 8h, Completionist 13½h.
Aria Of Sorrow: Main Story 7h, Completionist 14½h.
Dawn Of Sorrow: Main Story 10h, Completionist 25h.
Portrait Of Ruin: Main Story 10h, Completionist 22h.
Order Of Ecclesia: Main Story 11h, Completionist 22½h.
Harmony Of Despair: Main Story 10½h, Completionist 23h.