So time doesn't exist... That would explain how time seems to speed up when you're having fun and slow down when you're bored. If the illusion of time is caused by memory, and assuming the brain can only store a finite amount of data/second, when exciting things are going on we have more detailed but fewer records, causing the illusion of 'less time'. When things slow down and change less, we have less detailed (because there is less change and less new stuff to store), and more frequent records, causing a perception of "more" time. Makes sense to me.
Think for a moment about a mechanical computer. One that perhaps even happens to be sentient. This computer works by a complex gear mechanism that is driven by being moved forward on a track.
So as the black box moves forward along the track, the mechanical action drives a complex gear train that allows it to think. Since it thinks, it perceives itself, and it perceives itself to exist in a single dimension. It thinks that "right now" is the present, what it will think when it is a mile down the track as the future, and what it thought when it was a mile back as being in the past. Furthermore, a mechanical interlock prevents it from rolling backwards, or travelling back in time.
An outside observer can tell that "time" is just an illusion of the machine's motion down the track. However, because of the inherent nature of the machine, to it time is an inescapable quality of existence.
We are that machine. The track is the chemical reactions that take place in our brain and allows us to think. These chemical reactions are, thanks to thermodynamics and entropy, non-reversible. They only work as me move forward in time and that defines the nature of our existence. Bertrand Russell
For an easier read and an interesting take on this same idea, read Slaughterhouse Five by Kurt Vonnegut...
All time is time. it does not change. It does not lend itself to warnings or explanations. It simply is. Take it moment by moment, and you will find that we are all, as I've said before, bugs in amber.