Does Silence need to drag on so portentously throughout its middle third? Probably, at least to achieve its goal of being as tortuous as what its protagonists undergo. Not exactly as torturous, obviously, but that is the tone it is going for. It may not be pleasant, but that is the goal. Perhaps it could have been both painful AND exciting if Liam Neeson had returned earlier. His scenes really get the film cooking. They are, after all, when Silence really grapples with its essential question of how best to sacrifice oneself to be a good Catholic, or a good leader, or a good person, and if those overlap.
I give Silence 20 Minutes out of 161 of Unexpected Humor.