25 Times of the Gentiles

What is the "time of the Gentiles" and how long does it last. This teaching on Revelation 11:1-2 provides the background for the command to "rise and measure the temple" and insights into the trampling of the holy city.

Then I was given a measuring rod like a staff, and I was told, "Rise and measure the temple of God and the altar and those who worship there, but do not measure the court outside the temple; leave that out, for it is given over to the nations, and they will trample the holy city for forty-two months. (Revelation 11:1-2)