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I wonder where peter got the idea that a day with God was as a thousand years and a thousand years as a day? Could he have gotten it from the creation story in Genesis?

Nope. Peter "got it" from Psalm 90:4, "Because a thousand years in your eyes is like a day that is finished when it is passed and like a watch of the night." Matthew Henry's Concise Commentary says:

A thousand years are nothing to God's eternity: between a minute and a million of years there is some proportion; between time and eternity there is none. All the events of a thousand years, whether past or to come, are more present to the Eternal Mind, than what was done in the last hour is to us. And in the resurrection, the body and soul shall both return and be united again. Time passes unobserved by us, as with men asleep; and when it is past, it is as nothing. It is a short and quickly-passing life, as the waters of a flood. Man does but flourish as the grass, which, when the winter of old age comes, will wither; but he may be mown down by disease or disaster.

In eternity, there is no such thing as time. Time has no relation to God; it does not exist for him. So, for God - and for us, as well, in heaven, one day is no different than a thousand years, a hundred thousand years or a million years. But, when God DOES speak of a day in earth time and specifically says "evening and morning", then He IS talking about a literal, 24-hour day - like in Genesis.

Nope. Peter “got it” from Psalm 90:4,

Ok, thanks.

In eternity, there is no such thing as time. Time has no relation to God; it does not exist for him. So, for God - and for us, as well, in heaven, one day is no different than a thousand years, a hundred thousand years or a million years. But, when God DOES speak of a day in earth time and specifically says "evening and morning", then He IS talking about a literal, 24-hour day - like in Genesis.

Or the evening and morning were the first part of the day and the second part of the "day". Regardless, "generations" of man does not occur in a 24 hour day.