A Thousand is Always a Thousand

"A thousand is always a thousand" is what some say to defend their literal view of the millennium. They ignore the genre of the book which is apocalyptic in nature. In apocalyptic literature a literal number is almost never literal. But let's try another test text:

Psa 50:10 For every beast of the forest [is] mine, [and] the cattle upon a thousand hills.

Does that mean that God does not own the cattle on hill number 1001? Or was the intended meaning that God owns everything and the number 1000 merely a way of using a big number to make a point?

At this point the defenders of the millennium as 1000 literal years of 365 days will say, well that's poetic language there in Psalms. The fact is, this is Revelation, which is even more coded language and much less literal that the Psalms. It seems like the 1000 years is one way of saying a very long time, much longer than the lifespan of a person.