If you are referring to “the times of restitution of all things” (Acts 3:21, KJV), is there anything in the context indicating this will occur at one moment, namely the “second coming of Christ” when there is “the resurrection from the dead”? I would note that it says “times” (plural), not time (singular).
There is also the matter of there being multiple resurrections spoken of in the Scriptures:
They came to life and reigned with Christ a thousand years. 5 (The rest of the dead did not come to life until the thousand years were ended.) This is the first resurrection. 6 Blessed and holy are those who share in the first resurrection. (Rev.20)
They cannot all be resurrected when Christ returns, since they occur 1000 years apart.
Following the 2nd resurrection, men will be judged by their works, & those not found in the book of life cast into the lake of fire, which is the second death (Rev.20:10-15). Jesus said the judgement would be more tolerable for some than others (Matthew 10).
And the Adversary who is deceiving them was cast into the lake of fire and sulphur where the wild beast and where the false prophet are also. And they shall be tormented day and night for the eons of the eons. (Rev.20:10, Concordant Literal New Testament, 1983)
Rev.14:11 And the fumes of their torment are ascending for the eons of the eons. And they are having no rest day and night, those worshiping the wild beast and its image, and if anyone is getting the emblem of its name. (CLV)
And after resurrection there are those who will experience shame & contempt (the wrath of God, Rom.2?):
Dan.12:2 Multitudes who sleep in the dust of the earth will awake: some to eonian life, others to shame and eonian contempt.
And those who died in a state of “being incensed against Him” will thereafter be “ashamed”:
Isa.45:22 Look unto me, and be ye saved, all the ends of the earth: for I am God, and there is none else.
23 I have sworn by myself, the word is gone out of my mouth in righteousness, and shall not return, That unto me every knee shall bow, every tongue shall swear.
24 Surely, shall one say, in the LORD have I righteousness and strength: even to him shall men come; and all that are incensed against him shall be ashamed.
That “shame” could occur inbetween death & resurrection, or must occur after resurrection, depending on one’s view of the “state of the dead”. Either way, these passages (and others) rule out ultra-URism.
Ultra-Universalism Refuted: