Rev. 21:25 " On no day will its gates ever be shut, for there will be no night there."
Rev. 20:10 And the devil, who deceived them, was thrown into the lake of burning sulfur, where the beast and the false prophet had been thrown. They will be tormented day and night for ever and ever.
No night in the New J; but days and nights in the lake of fire?
Short answer… it is hyperbolic language.
Slightly longer answer… some might answer (I don’t) that the ‘lake of fire’ being outside the NJ doesn’t come under the said parameters of the NJ.
This example provides further proof that the Greek words αἰῶνας τῶν αἰώνων in Rev. 20:10 do not really mean in English “for ever and ever.”
One possibility… during the period represented by the lake of fire, God is not yet all in all… death has not yet been anulled…time is still in play- days and nights… the “administration suitable to the fulness(completion) of times” is still ongoing.
The New Jerusalem…
But you have come to Mount Zion and to the city of the living God, the heavenly Jerusalem, and to myriads of [h]angels, 23 to the general assembly and church of the firstborn who are enrolled in heaven, and to God, the Judge of all, and to the spirits of the righteous made perfect, 24 and to Jesus, the mediator of a new covenant, and to the sprinkled blood, which speaks better than the blood of Abel…
…transcends time, and its gates are the portals into the everlasting Day of God, where all things will become one in Him… death will be swallowed up by immortality