Sea of Stars typically takes about 25 to 30 hours to complete the main story for most players. If you focus on the main objectives without extensive side content, expect around 28 hours on average. For players aiming for 100% completion, including all side quests and achievements, the playtime can extend to approximately 40 to 45 hours, with some estimates going up to 50 hours or more depending on how much extra content you engage with