not only is 1 day is as 1000 years but it is also said that 1000 years is as 1 day.
2Cor 4:16-18 (YLT)
wherefore, we faint not, but if also our outward man doth decay, yet the inward is renewed day by day; for the momentary light matter of our tribulation, more and more exceedingly an age-during weight of glory doth work out for us-- we not looking to the things seen, but to the things not seen; for the things seen are temporary, but the things not seen are age-during.
maybe the 1000 year reign is the life we live on the earth with God for in the world it seems life last long and yet in heaven it will have felt like a day. but also in heaven it would seem that we shall so clearly see the beauty of our lives in Christ that it will be like 1000 years, if it was lived in the two great commandments. maybe we get to participate along with the angels in helping the world after we die so the reign of the kingdom of heaven is our human life and in heaven in being good spirits assisting the world and praising God, thus the 1 and the 1000.
also "the momentary light matter of our tribulation" (1 day) compared to the "more and more exceedingly an age-during weight of glory doth work out for us" (1000 years)
"things seen are temporary" (1 day), but that the "not seen are age-during." (1000 years)
also the "outward man doth decay" (1 day) but "the inward is renewed day by day;" ( 1000 years)
Luke 17:20-24 (YLT)
And having been questioned by the Pharisees, when the reign of God doth come, he answered them, and said, `The reign of God doth not come with observation; nor shall they say, Lo, here; or lo, there; for lo, the reign of God is within you.' And he said unto his disciples, `Days will come, when ye shall desire to see one of the days of the Son of Man, and ye shall not behold it ; and they shall say to you, Lo, here; or lo, there; ye may not go away, nor follow; for as the lightning that is lightening out of the one part under heaven, to the other part under heaven doth shine, so shall be also the Son of Man in his day;
the lightning happens so fast (1 day) but also all of heaven is lighted up by it (1000 years), so we see the fast nature of human life but also the significance of it to and in heaven. for the deeper parts of us are already rooted in eternity and yet we exist as creatures in time.
so I think that our short human lives is like a very intense time for our spirit and soul to flourish in this hard world of trials but to our spirit it is like 1000 years of growth and expansion towards the Lord because in heaven we can more clearly feel and see God but in the earth we are pretty dumbed down and so have in some ways more ability to freely express certain things to God like our faith and weakness as fragile creatures but still clinging to the Lord in our times of darkness and weakness.
the parables explain my thoughts as well concerning the spiritual development of different people depending on what they do with the time allotted us, when we die and go to the next age since our treasures are in heaven and we are seated in heavenly places with Christ. long bible quotes:
Luke 19:11-27 (YLT)
And while they are hearing these things, having added he spake a simile, because of his being nigh to Jerusalem, and of their thinking that the reign of God is about presently to be made manifest. He said therefore, `A certain man of birth went on to a far country, to take to himself a kingdom, and to return, and having called ten servants of his own, he gave to them ten pounds, and said unto them, Do business--till I come; and his citizens were hating him, and did send an embassy after him, saying, We do not wish this one to reign over us. `And it came to pass, on his coming back, having taken the kingdom, that he commanded these servants to be called to him, to whom he gave the money, that he might know what any one had done in business. `And the first came near, saying, Sir, thy pound did gain ten pounds; and he said to him, Well done, good servant, because in a very little thou didst become faithful, be having authority over ten cities. `And the second came, saying, Sir, thy pound made five pounds; and he said also to this one, And thou, become thou over five cities. `And another came, saying, Sir, lo, thy pound, that I had lying away in a napkin; for I was afraid of thee, because thou art an austere man; thou takest up what thou didst not lay down, and reapest what thou didst not sow. `And he saith to him, Out of thy mouth I will judge thee, evil servant: thou knewest that I am an austere man, taking up what I did not lay down, and reaping what I did not sow! and wherefore didst thou not give my money to the bank, and I, having come, with interest might have received it? `And to those standing by he said, Take from him the pound, and give to him having the ten pounds-- (and they said to him, Sir, he hath ten pounds) -- for I say to you, that to every one having shall be given, and from him not having, also what he hath shall be taken from him, but those my enemies, who did not wish me to reign over them, bring hither and slay before me.'
Mark 4:1-34 (YLT)
And again he began to teach by the sea, and there was gathered unto him a great multitude, so that he, having gone into the boat, sat in the sea, and all the multitude was near the sea, on the land, and he taught them many things in similes, and he said to them in his teaching: `Hearken, lo, the sower went forth to sow; and it came to pass, in the sowing, some fell by the way, and the fowls of the heaven did come and devour it; and other fell upon the rocky ground, where it had not much earth, and immediately it sprang forth, because of not having depth of earth, and the sun having risen, it was scorched, and because of not having root it did wither; and other fell toward the thorns, and the thorns did come up, and choke it, and fruit it gave not; and other fell to the good ground, and was giving fruit, coming up and increasing, and it bare, one thirty-fold, and one sixty, and one an hundred.' And he said to them, `He who is having ears to hear--let him hear.' And when he was alone, those about him, with the twelve, did ask him of the simile, and he said to them, `To you it hath been given to know the secret of the reign of God, but to those who are without, in similes are all the things done; that seeing they may see and not perceive, and hearing they may hear and not understand, lest they may turn, and the sins may be forgiven them.' And he saith to them, `Have ye not known this simile? and how shall ye know all the similes? He who is sowing doth sow the word; and these are they by the way where the word is sown: and whenever they may hear, immediately cometh the Adversary, and he taketh away the word that hath been sown in their hearts. `And these are they, in like manner, who on the rocky ground are sown: who, whenever they may hear the word, immediately with joy do receive it, and have not root in themselves, but are temporary; afterward tribulation or persecution having come because of the word, immediately they are stumbled. `And these are they who toward the thorns are sown: these are they who are hearing the word, and the anxieties of this age, and the deceitfulness of the riches, and the desires concerning the other things, entering in, choke the word, and it becometh unfruitful. `And these are they who on the good ground have been sown: who do hear the word, and receive, and do bear fruit, one thirty-fold, and one sixty, and one an hundred.' And he said to them, `Doth the lamp come that under the measure it may be put, or under the couch--not that it may be put on the lamp-stand? for there is not anything hid that may not be manifested, nor was anything kept hid but that it may come to light. If any hath ears to hear--let him hear.' And he said to them, `Take heed what ye hear; in what measure ye measure, it shall be measured to you; and to you who hear it shall be added; for whoever may have, there shall be given to him, and whoever hath not, also that which he hath shall be taken from him.' And he said, `Thus is the reign of God: as if a man may cast the seed on the earth, and may sleep, and may rise night and day, and the seed spring up and grow, he hath not known how; for of itself doth the earth bear fruit, first a blade, afterwards an ear, afterwards full corn in the ear; and whenever the fruit may yield itself, immediately he doth send forth the sickle, because the harvest hath come.' And he said, `To what may we liken the reign of God, or in what simile may we compare it? As a grain of mustard, which, whenever it may be sown on the earth, is less than any of the seeds that are on the earth; and whenever it may be sown, it cometh up, and doth become greater than any of the herbs, and doth make great branches, so that under its shade the fowls of the heaven are able to rest.' And with many such similes he was speaking to them the word, as they were able to hear, and without a simile he was not speaking to them, and by themselves, to his disciples he was expounding all.