Multiple outlets report that Splatoon Raiders is structured primarily as a campaign-focused experience, with players working through main missions at their own pace in either solo play or online co-op. Reported time to reach the campaign’s end centers around 15–18 hours for an average run that includes engaging with optional activities. These optional elements include completing tasks tied to rewards such as additional outfits, experimenting with a range of weapon variations, and searching for collectible items such as Salmonid Relics. Reviewers also indicate that the total time can increase depending on difficulty selection, with easier and harder settings affecting how long it takes to progress through missions. VICE notes that some reviewers clock the game at as high as 40 hours, suggesting longer playthroughs for those who pursue more content beyond the core storyline. After the main campaign, the game continues with endgame or post-game raid-style challenges that can extend overall playtime further. Both accounts describe online co-op as a key part of how players engage with harder raids after completing the campaign.