I only read the first post in this topic, but I just have to say
A few nights before I started having some LDs I had some NDs where I slowed down time intentionally and did amazing tricks and moves for sports, fighting, whatever
It’s very fun 
If you used this to prolong dreams though, I don’t think it will work, and I think it will just be boring
I believe that your mind can speed up in a dream so it seems like you are in it for longer than you really are.
The theory that your mind fills in the gaps of your dream after you wake up doesn’t make much sense if you think about it. If you wake up and you feel like you were dreaming for a week, and you have all the memories of a week of dreaming, then it may as well have happened.
I know it is possible to speed up your brain so that the world seems like it is going in slow motion, because that happens to me all the time. Whenever you have an adrenaline rush, like when you’re about to get in a car wreck, your mind speeds up and gives you a chance to think about the situation and come up with the best solution to help avoid the wreck. This has saved me from serious injury or death many times. If time had not slowed down, I know I would have not have been able to think fast enough.
I have also heard (correct me if I’m wrong) that there is no place in your brain that is responsible for memory. Sure there are places in the brain that are used to store the memory, and there are places that are used to bring the memories back, but where were they before they were retrieved? And what part of the brain tells the brain to make the electrical pulses to retrieve memories?
My theory: there must be a part of the mind that is not physical at all and, therefore, not governed by physical laws such as time and space, and we tap into that section of the brain when we sleep.
You can do anything in your dreams. You can even time travel.
@7Regrets: That is, given you have good visualization and can allow yourself to let things be surreal without losing control over them. 
I too have realized the mind seems to be able to fast–forward dreams, and I wonder if that’s a skill one could use as a lucid dreamer. Slowing time down, on the other hand, sounds really dispending. I don’t think I’d be able to do that on will. Worth giving a shot anyways.
Both time distortion effects remind me of a Legend of Zelda game: Majora’s Mask. Has anyone played it? It might be an idea, for a good visualizer and a great believer, to find an ocarina, play the tune and just let the subconscious do the rest for you. 
I slowed time down in my very first LD. I wanted to do the slow motion walk (seriously weird want) and I could feel and see the world pass by slowly, the pulling back…everything. Very vivid and amazing. The skies the limit in dreams. 
Iono, I don’t think I would like to experience days/months/years in a dream. I think it would freak me out.
That could just be the reason most people don’t experience it. It may be that you need to have plans enough for that length of time befor your SC will let you do it. 
don
Well considering I’ve had dreams that were played out over a period of days when I’m only sleeping 9 hours I would say that proves that dreams have their own time. Truley your brain is dreaming in fast forward so it fits in a period of 9 hours, but when you remember the dream your brain is slowing it down.
That’s my theory.
I read about that too TZer00 it was Lar’s Lucid Dreaming FAQ
I believe it’s possible to “dream longer than you sleep”.
Simply put for the fact that i’ve done it on multiple occassions.
In “My” dream universe I have once visited this place in which there’s a tower (and that place always exists on a seperate dimension in my ‘‘dream realm’’) which holds someone called “The Watcher”.
He has taught me how to extend my dreams, and it seemed to work.
The 2 best moments:
1. I once Started sleeping at 9:30, I had a lucid for 30 minutes of ACTIVITY, so no time skipping or w/e.
I woke up, clock read: 9:31
2. I once started sleeping again at 9:54 I had a lucid, when I woke up.
It was 9:04
Now THIS is the most weird one that I can’t even truly believe myself.
I HAVE seen the clock and I WAS awake enough to realize that it really said 9:54, and when I woke up it DID really say 9:04.
So I guess, that’s just. really weird O.o
Time is an illusion. It is now. It always has been. Days, months, years etc are all inventions. So maybe you can slow down time in your dream, but it will still be now, and all you’ll have is a memory of a dream which seemed to be longer then then change in digits on your clock.
I really don’t think it’s quite that simple to affect the perception of time just by shouting a command. Also, the reason you can’t LD might be just that you want it so damn bad and expect more than is actually possible through lucid dreaming. That can work against you.
But if it was that easy. Just a matter of believing. And using a command. It is worth a try considering the potential payoff wich may be revolutionary.
Personally, i had nearlly same thing. It was bit after 11, and i wanted to get up (i mean give up trying to get a LD, and stand up). I accidentaly falled asleep again, and i had a LD. Not very long, but i’ve done more that in not one LD. When i waked up it was 2 minutes later 
In phisical, slowmotion - i’ve been doing it few times, even half hour before now. Nothing hard, i thinks that everyone would do it at first try. But flying is bit more awesome.
And not-personally:
Hmpf. Never tried slowing down time… I’ve forwarded time in one LD, though. Well, not so much forwarded as “skipping chapters”, I guess.
Heh. Now why does that remind me of Adam Sandler’s ‘Click’?
I’ve never really been able to slow down time in a dream, but I can pause the dream with a Playstation controller that I usually carry around (which I had to use in a recent Resident Evil-like zombie dream–those zombies were fast 
Good thing I had that controller )
But tou wouldn’t be devistated if you knew your life was just a dream. I think nearly anything is possible in lucid dreaming i mean you can fly control people and do anything you want!
when you think about it though, when you wake up from dreaming, you remember that it was just a dream, so if what we call “reality” is just a dream, when we wake up from it, we’ll remember it was a dream
i notice how the post starts off fine then slowly becomes absorbed into crackpot (and i use that term lightly) theory’s. But on a serious note, my friend claims to have had a dream that seemed to last a couple days, and i think i heard the longest LD recorded was like 100 years (one night in RL).
But why would someone want to dream for years at a time? Is it because they are making a desperate attempt to prolong their own life, fearing death? Well, everyone knows there are two things you can’t avoid, Death and Taxes. I could see wanting a few days or maybe weeks of dreaming, to do with what you will. But years? why? wouldn’t you miss everyone you love in the real world? And if you dream for 100 years, won’t you lose touch with reality?