Where in Scripture does it say that "the NHNE is a process that begins with the 2nd coming, thus something not instantaneous"?
This old earth and heaven dissolve fast in a sudden destruction. A fiery one. Fire like that seems to me will burn things up pretty fast.
Then what's left? What comes next is the Judgment. The return of Christ is the Day of Judgment. After that we get our New heaven, New earth. And we enter into the eternal, everlasting state of creation.
34 Then the King will say to those on His right hand, ‘Come, you blessed of My Father, inherit the kingdom prepared for you from the foundation of the world:
Fervent
having or displaying a passionate intensity:
"a fervent disciple of tax reform"
Similar:
impassioned
passionate
intense
vehement
ardent
- archaic
hot, burning, or glowing.
The Day of the Lord
10 But the day of the Lord will come as a thief in the night, in which the heavens will pass away with a great noise, and the elements will melt with fervent heat; both the earth and the works that are in it will be [
d]burned up. 11 Therefore, since all these things will be dissolved, what manner
of persons ought you to be in holy conduct and godliness, 12 looking for and hastening the coming of the day of God, because of which the heavens will be dissolved, being on fire, and the elements will melt with fervent heat? 13 Nevertheless we, according to His promise, look for new heavens and a new earth in which righteousness dwells.