When do the ages of the ages (translated into English as "forever and ever") begin according to Revelation 11:15?
The phrase “ages of ages” refers to successive ages, as the Millennium itself is divided into shorter periods. At the end of Christ’s thousand-year reign, the perfected Kingdom will be handed over to God (1 Corinthians 15:24). In these verses, the final consummation is mentioned first, followed by the events that lead up to it (compare verses 18–19). Rev 1:6 also reveals the Saints activities in this age. After this age "Kings and Priests" will no longer be required as God will be All in All.
How long is He going to be inflexible with rebels from Revelation 11:15 onward, according to Revelation 2:27?
Satan (sin) bound for 1000 years - Although the “beast” and the “false prophet” have been silenced, the moral regeneration of humanity still remains to be accomplished, along with the complete and final conquest of sin and death. This work will extend over a thousand years.
Paul declares,
“For he must reign, till he hath put all enemies under his feet. The last enemy that shall be destroyed is death” (1 Corinthians 15:25–26). When this is achieved, a perfected Kingdom will be handed over to God, “that God may be all in all” (1 Corinthians 15:28).
Rev 20 outlines the means by which this purpose is fulfilled. Though “the dragon”, symbolizing political rebellion against the rule of God (Revelation 2:10; 12:3–4) will be subdued at Armageddon, its influence will not be entirely eliminated until the close of Christ’s reign.
Having dealt with the “beast” and the “false prophet,” Christ will then proceed to restrain the “dragon,” progressively limiting its influence until its very source, human flesh and its sinfulness is finally overcome and swallowed up in life.
If one insists on interpreting these figures as literal supernatural evil angels, the symbolic meaning of these important images will be missed. In one breath, such an interpretation may acknowledge earthly rebellion, and in the next, contradict itself by introducing fallen angels and literal wars in heaven.
You are on the right track if you understand that Christ and the saints will rule from Jerusalem, the future capital of the world. From there, he will judge the nations with a rod of iron, maintaining righteous authority. At the appointed time, sin will be released, and Christ and the saints will withdraw their restraining influence, allowing the rebels to follow their chosen course. In the end, they will be destroyed, along with death and the grave.