Voyager has a three tier dining room. Decks 3 and 4 have 2nd sitting at 8.30, whilst deck 5 is at 9p.m.
Also depends on when the ship departs, as ships can leave later depending on which port.
We were on the Voyager last May to the Med & were second sitting on Deck 5 at 9.30. Often were not allowed into the Dining Room until 9.45. Found it far too late.
First sittingon the Navigator in October to the Canaries was 6.30.