Da Naughty Dog i sin tid afslørede Uncharted: The Lost Legacy, en seperat historie der ikke kræver Uncharted 4: A Thief's End, men i stedet står ganske alene, så troede de fleste at der her var tale om en størrelseorden vi normalt ser med udvidelser, altså et par timers indhold. Eksempelvis var Naughty Dogs tidligere udvidelse til The Last of Us, Left Behind, ikke meget mere end et par timer langt.
I et interview med IBTimes fortæller Naughty Dogs Arne Meyer dog, at man i Uncharted: The Lost Legacy godt kan lede efter lidt mere:
"Years ago, when we were asked if we were ever doing a single player expansion for Uncharted we always said, 'Well, we don't have the self-discipline to do that'. If we tried to do that we'd create a full game. There's no way we could, sort of, constrict and restrain ourselves, and that's exactly what was happening here. When we were doing story pitches, we were coming up with a game that would be over ten hours long and so we suddenly realized everything we said was true and we couldn't keep it short."
Den udtalelse tyder på, at fans godt kan håbe på en længde på omtrent 10 timer.
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