How long did God's two witnesses prophesy in sackcloth (Rev 11)?

0 How long did God's two witnesses prophesy in sackcloth (Rev 11)?

Say unto God, How terrible art thou in thy works! Psalms 66:3

I will give power unto my two witnesses, and they shall prophesy a thousand two hundred and threescore days, clothed in sackcloth. Revelation 11:3

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