Okay, the White Throne Judgement takes place on earth after the millennial reign on earth. All those that had never had a chance to serve Christ will have their chance here. This includes the infant son of David, all the stillborn, toddlers, mentally handicapped and they that lived in Mongolia 600 BC. God is not going to raise all the people that has ever lived, to pass judgement on them because they just did not make the cut.
Those believers now are the blessed and holy bride of Christ that are being judged daily. There is no further judgement for them. The White Throne Judgement will be when most learn of Christ's sacrifice and then given their portion of the Holy Spirit. Satan will be loosed a little season to deceive those that reject the HS anointing. Some people will always insist on being evil. They will be mercifully destroyed and the end of all things. Most people will be saved during the WT Judgement.
I believe that this time of judgement will last 100 years based on the following scripture: Isaiah 65:17-25:"For, behold, I create new heavens and a new earth: and the former shall not be remembered, nor come into mind. But be ye glad and rejoice for ever in that which I create: for, behold, I create Jerusalem a rejoicing, and her people a joy. And I will rejoice in Jerusalem, and joy in my people: and the voice of weeping shall be no more heard in her, nor the voice of crying. There shall be no more thence an infant of days, nor an old man that hath not filled his days: for the child shall die an hundred years old; but the sinner being an hundred years old shall be accursed. And they shall build houses, and inhabit them; and they shall plant vineyards, and eat the fruit of them.
They shall not build, and another inhabit; they shall not plant, and another eat: for as the days of a tree are the days of my people, and mine elect shall long enjoy the work of their hands. They shall not labour in vain, nor bring forth for trouble; for they are the seed of the blessed of the LORD, and their offspring with them. And it shall come to pass, that before they call, I will answer; and while they are yet speaking, I will hear. The wolf and the lamb shall feed together, and the lion shall eat straw like the bullock: and dust shall be the serpent's meat. They shall not hurt nor destroy in all my holy mountain, saith the LORD." So, shoot me down if I am wrong.