I don't think anyone here would say God couldn't created the universe in six days just that it isn't the way he actually did it. And if God is not limited by our view of time, he might take longer on the new heavens and new earth than people think too. This is what 2Pet 3 is all about.
Let us take heed to the counsel of scripture and not unduly 'wrest' the Epistles of Peter any more than Paul's or other of the scriptures, and let us especially consider verse 8, but first:
2 Peter 3:16 As also in all [his] epistles, speaking in them of these things; in which are some things hard to be understood, which they that are unlearned and unstable wrest, as [they do] also the other scriptures, unto their own destruction.
2 Peter 3:17 Ye therefore, beloved, seeing ye know [these things] before, beware lest ye also, being led away with the error of the wicked, fall from your own stedfastness.
We are to be very mindful:
2 Peter 3:2 That ye may be mindful of the words which were spoken before by the holy prophets, and of the commandment of us the apostles of the Lord and Saviour:
So, that we are all duly warned against making such an error, let us carefully search out the matter in 2 Peter 3 and compare scripture with scripture:
2 Peter 3:3 Knowing this first, that there shall come in the last days scoffers, walking after their own lusts,
We are warned of scoffers, walking after their own lusts, their own covetousness and not seeking for the coming of the Lord.
2 Peter 3:4 And saying, Where is the promise of his coming? for since the fathers fell asleep, all things continue as [they were] from the beginning of the creation.
These scoffers have heard of the coming of Jesus, but mock at it because it has been so long in coming, that they proclaim that it will never happen. As it was in the days of Noe, and in the days of Lot, so shall it be... The Lord has promised, and He is coming, for there are many texts to look at upon this issue, but let us consider two for now (Therefore prophesy thou against them all these words, and say unto them, The LORD shall roar from on high, and utter his voice from his holy habitation; he shall mightily roar upon his habitation; he shall give a shout, as they that tread [the grapes], against all the inhabitants of the earth. Jeremiah 25:30; A noise shall come [even] to the ends of the earth; for the LORD hath a controversy with the nations, he will plead with all flesh; he will give them [that are] wicked to the sword, saith the LORD. Jeremiah 25:31).
The Lord has said that there would appear to be a delay in His coming (Matthew 24:48-51), but at the end it shall speak, (For the vision [is] yet for an appointed time, but at the end it shall speak, and not lie: though it tarry, wait for it; because it will surely come, it will not tarry. Habakkuk 2:3)
2 Peter 3:5 For this they willingly are ignorant of, that by the word of God the heavens were of old, and the earth standing out of the water and in the water:
2 Peter 3:6 Whereby the world that then was, being overflowed with water, perished:
These scoffers deny the Creation and the Flood by the word of the Lord. They may even say they believe, but they preach ignorantly and/or falsely concerning them and thus witness falsely about the very character of God. He is thus called a liar, though God be true and every man a liar. Many will have said, "Lord, Lord" and have been called by His name, but He does not know them.
2 Peter 3:7 But the heavens and the earth, which are now, by the same word are kept in store, reserved unto fire against the day of judgment and perdition of ungodly men.
Here we have the point of 2 Peter 3, namely that of the coming of Christ Jesus and His Judgment.
2 Peter 3:8 But, beloved, be not ignorant of this one thing, that one day [is] with the Lord as a thousand years, and a thousand years as one day.
Many have incorrectly used this text to place 'millions' or even 'billions' into Genesis, but the text does not say 'millions' nor 'billions', but rather 'a (single) thousand'. This texts is also not referencing Creation, but rather the Consumation at the end of the world.
Looking closer at vs. 8 we see that the passage does not directly equate 1 to 1000, but rather says, "as" ('like unto, but not the same') "a day", not "is" ('the same').
It is also revealed that there is a built in chiastic structure and ratio of 1:1000 and 1000:1, and therefore does not aide anyone in re-interpreting the literal days in Genesis. Peter is actually drawing this from an old testament text (see also Psalms 84:10):
For a thousand years in thy sight [are but] as yesterday when it is past, and [as] a watch in the night. Psalms 90:4
Peter is speaking about the soon coming of Christ Jesus, in that it has been promised and will be fulfilled in the Lord's time (Acts 1:7) though many now mock at it.
We may also see that
If scripture implied vast periods of time ('millions/billsions') in the Genesis Creation account days (insert a random unknown x believed astronomical number here), then why bother with 1-7 (1 being Cardinal, 2-7 being Ordinal, each including the definite article).
Why would the author bother with the phrase "evening and morning"? The Bible writers knew of massive numbers, See:
"thousands of millions" Genesis 24:60;
"of thousands, rulers of hundreds, rulers of fifties, and rulers of tens" Exodus 18:5;
"And shewing mercy unto thousands of them that love me, and keep my commandments." Exodus 20:6;
"he came with ten thousands of saints" Deuteronomy 33:2;
"his thousands, and David his ten thousands" 1 Samuel 18:7;
"the number of them was ten thousand times ten thousand, and thousands of thousands" Revelation 5:11.
The writers also knew of "Seasons", "Months" and "Years". Why theey then bother implementing the word "day" with a specific numerical (and ordered 1-7) value attached, and instead say "many seasons", "many months/moons", "many years", "Thousand times ten thousand" or whatever is needed?
In every single case, with but one known "exception"* in numbers One to One Thousand (*Zechariah14:7), in scripture where there is a number (whether Cardinal or Ordinal) with the Hebrew word "yôm" (150 times) it always means a standard literal day and nothing else. In fact, Genesis itself sets the rule. Genesis:
1. The term "yôm" is always in the singular.
2. The term "yôm" is always joined to a numeral (whether cardinal or ordinal)
3. The term "yôm" is always a noun. It is not once combined in a compound construct, neither seen with a preoposition, nor genetive combination.
4. The term
"yôm" is gnerally defined with phrases related to time, "evening and morning", "light" and "dark".
Genesis is instead very specific and structured so that it cannot be trifled with, and supported by Exodus, Psalms, Gospels, Epistles and Revelation.
2 Peter 3:9 The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance.
We see Peter speak about the promise, and that the Lord is not slack, as some (now many) count slackness. God is patient toward sinners, so that more yet may be saved from the consumation and destruction to come.
2 Peter 3:10 But the day of the Lord will come as a thief in the night; in the which the heavens shall pass away with a great noise, and the elements shall melt with fervent heat, the earth also and the works that are therein shall be burned up.
The Day of the Lord will come suddenly, when we least expect it, which is why we are told to be ready now, not later, for people will continue on and be planting, buying, selling, marrying and giving in marriage when the day happens.
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2 Peter 3:12 Looking for and hasting unto the coming of the day of God, wherein the heavens being on fire shall be dissolved, and the elements shall melt with fervent heat?
2 Peter 3:13 Nevertheless we, according to his promise, look for new heavens and a new earth, wherein dwelleth righteousness.
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2 Peter 3:15 And account [that] the longsuffering of our Lord [is] salvation; even as our beloved brother Paul also according to the wisdom given unto him hath written unto you;
In each passage we see Peter speaking about the soon coming of Christ Jesus and the consumation. There will come a day, soon to happen according to scripture, for we can know when it is near, yea even at the doors. Just as the Flood happened, just fire destroyed Sodom and Gomorrah, destruction is coming to the wicked, the deceivers and the mockers. Probation closed for those standing outside of the Ark forever when the door was shut, and it took a whole week yet still for the results to be made known. Let us choose today to be in the only means of salvation.
Be not deceived; God is not mocked: for whatsoever a man soweth, that shall he also reap. Galatians 6:7
Let us sow the good seed and not the seed of tares.