Longest LD? I’m tempted to say somewhere around 20 minutes, but I know how extraodrinarily twisted your sense of time usually is in a dream.
Why not extend the question a little, and state what you consider to be your average length? I’d probably say 5 minutes would be fair, in my case.
It’s somewhat hard to say. I guess my longes one would be about 4 minutes and average would probably be about 30 seconds.
My LDs tend to be either around 1 minute or shorter than 10 sec. So the average gets guite low.
Less than a minute
a few hours… they normally last about 10 min though.
i have had a LD that felt as though it were a complete day, but it obviously wasnt in RT because i woke up 2 hours after my first awakening
God…I’d say my longest was about 5-10 minutes, if even.
It’s shortness was made up for by it’s Matrix-y coolness. 
Except some very special cases, like Third Eye Open Wide’s dream, the subjective time should not be inaccurate too much.
In a laboratory experiment, the dreamer Florence Ghibellini estimated that her dream had a duration of 20 minutes. Effective measurement : 10 minutes.
This example is taken from her dream book.
It’s pretty interesting that some lucid dreamers even claim that they have experienced lucid dreams of a year long. Of course, as many of you already pointed out, it is a matter of subjectivity.
Research shows that this “time-bending” actually takes place in the process of awakening. This is not something that you can compare with a question like “is 30 minutes al long time?” as if it were totally subjective. It is more objective than you might think. The ‘feeling’ of time is sometimes neurologically manipulated somehow in waking up. So it really feels like you have been dreaming for a year long, although it took only 10 minutes of REM sleep.
This is something else than subjectivity! 
Mine always seem to be around 20 minutes, but when I wake up I realize I only did a few things and it seems like it couldn’t have been that long… It’s strange.
How long was your longest lucid dream?
I don’t mean how much time elapsed in real life. That’s unimportant. I mean how long the dream seemed to last.
I’ve never managed to go beyond 20-30 seconds 
All those spinning, focuseing and rubbing techniques never seem to work for me.
7-10 minutes.
my first LD 
You just have to remember to not get too excited. The minute you feel your heart pumping wildly just try your best to clear your mind (keeping the awareness by possibly looking around at people/stuff), and breath deeply (…in your mind). Then, when you’re ready to think about dreaming again, make sure you’re always focused on doing something, and make sure you’re only doing things that you can partake in immediately. So if one of your goals was to jump off a high building, and you’re standing on the ground away from a building, it might be better for your concentration to do something that you wanted to do on the ground (or try flying up there 
15-20 seconds…
idk, 4-6 min.?
1 week
wow, are you serious?
I think never over a minute.
But I think once or twice was more then 20 sec, well dream time was maybe over a minute.
I got this problem with memory, i forget almost entire dream. I am totaly 
because of that.
Around 15 minutes…I think. Time feels different in dreams than in real life for me, like I don’t notice time is ‘there’, you know?
7-10 minutes for your first one? Very nice
Heh, my problem is I ALWAYS find the nearest girl and start banging her 
. I can’t think of anything else to do. I’ve had maybe 10-15 lucid dreams rangeing from 5 to 30 seconds. And in each one that got past 10 seconds I ended up nailing some chick and wakeing up or looseing lucidity shortly after I start. 
I wish I wasn’t such a perve sometimes.
And in reply too BenDrummin58
That’s incredible! Could you elaborate some?
15 minutes. [edited later: after verification, it’s 30 minutes.]
Bendrummin58 is kidding a little. His dream lasted 1 week in the dream world,
[url]https://community.ld4all.com/t/do-you-have-the-most-interesting-ld/11578/1]
and about 1 hour IRL… 
which is still impressive!
wow, that’s Amazing. I can’t even begin to contemplate that.