20 YEARS...

What we call "time" is in fact a method by which ONE MOMENT IS COMPARED TO ANOTHER. For example, when a person taps an object, he hears a particular sound. If he taps the same object again, he hears another sound. Thinking there is an interval between the two sounds, he calls this interval "time." Yet when he hears the second sound, the first one he heard is no more than a memory in his mind, merely a bit of information in his imagination. A person formulates his perception of time by comparing the moment in which he lives with what he holds in memory. If he doesn't make this comparison, he can have no perception of time either.
Briefly, time comes about as a result of comparisons of information stored in the brain. If man had no memory, his brain could not make such interpretations and therefore, he would never form any perception of time. One determines himself to be twenty years old (AS I’M DETERMINING MYSELF TO BE SO AT 00:01 AM ON WED. 05-04-06), only because he has accumulated in his mind information pertaining to those twenty years. If his memory did not exist, then he could not think of any such preceding period and would be experiencing only the single "moment" in which he was living.
IF PEOPLE HAD NO MEMORIES, THEY WOULD NOT THINK OF THE PAST AS A PERIOD OF TIME, BUT AS A PERCEIVED “MOMENT.”

Because of suggestions we receive, we think we live in separate divisions of time called past, present and future. However, the only reason we have a concept of "past" (as we explained earlier) is that various things have been placed in our memories. For example, the moment we enrolled in primary school is a bit of information in our memory and we perceive it therefore as an event in the past. However, future events are not in our memories. Therefore, we regard these things that we do not yet know about as things that will be experienced or happen in the future. But just as the past has been experienced from our point of view, so has the future. But, because these events have not been given to our memories, we cannot know them.

http://www.thestoneage.org/
If God puts future events into our memories, then, the future would be the past for us. For example, a twenty year old person has twenty years of memories and events in his memory and, for this reason, thinks he has a twenty year past. If future events between the ages of twenty and seventy were to be put into this person's memory, then, for this twenty year old individual, both his twenty years and the "future" between the ages of twenty and seventy, would become the past. In this situation past and future would be present in the memory, and each one would be lived experiences for him.
Because God has made us perceive events in a definite series, as if there were a time moving from past to future, He does not inform us of our future or give this information to our memories. The future is not in our memories, but all human pasts and futures are in His eternal memory. This, as we said before, is like observing a human life as if it were already wholly depicted and complete in a film. Someone who cannot advance the film sees his life as the frames pass one by one. He is mistaken in thinking that the frames he has not yet seen constitute the future.

We rely on our five senses to live. We perceive only what our senses allow and we can never succeed in stepping out of the boundaries of our senses. The time and space we live in is similarly perceived. If our brain cannot detect a being through our five senses, we simply say that that being has "disappeared." Accordingly, for us, events, images or sensations, which are stored in our memory, exist, i.e., they are alive, while those that are forgotten no longer exist. To put it another way, beings and events, which are not in our memory, become past events for us; they are simply dead and non-existent.
Yet, this holds true only for human beings; that is because it is only human beings who have a limited memory. THE MEMORY OF GOD, ON THE OTHER HAND, IS SUPERIOR TO EVERYTHING. It is boundless and eternal. Yet one point deserves mention here: the concept "the memory of God" is used only for clarification purposes. It is definitely unlikely that any comparison or similarity could be drawn between the memory of God and the memory of a man. God is surely the One Who creates everything from nothingness and Who knows everything down to the last detail.
Because the memory of God is infinite, nothing existent in Him becomes lost. In other words, NO LIVING BEING CREATED BY GOD VANISHES, NO FLOWER FADES, NO DRINK FINISHES, NO PERIOD COMES TO AN END, AND NO FOOD IS CONSUMED… In its first form as a cloud of dust, the universe is in God’s sight; every moment in history exists in His sight as they were: stones of Stonehenge are being put in place, the Egyptian pyramids are being constructed, the Sumerians are searching the stars, Neanderthals eke out their living, the Lascaux cave drawings are being painted, people live in Catal Huyuk and the Second World War is raging. In the same way, societies that will live thousands of years from now exist in God’s sight as they are building their civilizations and ordering their lives.
ETERNITY HAS BEGUN FOR A BEING OR AN EVENT BY THE TIME IT IS CREATED. FOR INSTANCE, WHEN A FLOWER IS CREATED, IT IS, IN REALITY, DESTINED NOT TO DISAPPEAR. THAT THIS BEING CEASES TO BECOME A PART OF ONE’S SENSATIONS AND IS ERASED FROM ONE'S MEMORY DOES NOT ACTUALLY MEAN THAT IT HAS VANISHED OR DIED. ITS STATE IN THE SIGHT OF GOD IS WHAT ACTUALLY MATTERS. FURTHERMORE, ALL STATES OF THIS BEING, BE IT ITS CREATION, ALL MOMENTS THROUGHOUT ITS LIFE OR DEATH, DO EXIST IN THE MEMORY OF GOD. U BETTER MAKE THEM GOOD ONES… OR ELSE, IT WON’T BE PLEASANT!