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I recently encountered this sentence:

床には血痕が残っている。かなり時間が経つのか血が固まっている。

I believe I understand that the second part is saying the blood is dry (or has hardened) because quite some time has passed. I'm not sure what the か after 経つの is doing -- is the speaker not quite sure if that's the right explanation (something like, "The blood has hardened, perhaps because a lot of time has passed")?

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4

Your explanation is right.

The speaker is not quite sure if that's the right explanation (something like, "The blood has hardened, perhaps because a lot of time has passed").

The grammar you are looking for is defined in this page, which says:

疑いの気持ちで推定する意を表す

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