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

For every kind of beasts, and of birds, and of serpents, and of things in the sea, is tamed, and hath been tamed of mankind. James 3:7

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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