How long is the Millennial Kingdom?

Les teaches that the Kingdom is that last thousand years of human history on the planet, pretty much as we know it, except the curse will be lifted and everything will revert back as it was in the Garden of Eden. It will be a time of true glory, a perfect government with Christ the King, and no sin because Satan is locked up. It will be the utopia that all of human history has been looking forward to. Only believers will go into the Kingdom. The surviving people of the Tribulation period who go into the Kingdom include the remnant of Jews who fled Jerusalem at the midpoint and the few survivors in Isaiah chapter 24. Out of those survivors, a percentage will have heard the Gospel from the 144,000, become believers, and be ready for the Kingdom. The survivors who rejected the Gospel from the 144,000 will be removed from the scene. Jesus depicted this in Matthew 25 when He separated the sheep from the goats, and those were all Gentiles, with no Jews involved in that judgment.