One of the main achievements, similar to the goal from the first part, requires completing the game 100% in 30 hours. The figure reflects a "fast" attempt, indicating that the real playthrough will take much longer.
PCGamesN notes that, unlike the original, the new story with Hornet includes more than 40 bosses and a much larger world filled with secrets and hidden routes. For those who are going to explore every corner and defeat all optional opponents, the real estimate of the duration reaches 100 hours. The first game required dozens of hours from fans of full completion, and Silksong raises the bar even higher in terms of content and level of challenges.
Of course, a lot depends on skills. Experienced players can complete the story in about 40 hours, while less prepared players or those who focus on exploration will spend much more. For the fastest, there is an extreme goal — a speedrun in less than 5 hours, a challenge exclusively for veterans of the metroidvania genre.