Studies in animals do show that N-REM dreams do pass at high speed but only like 10-20x and they seem to run both forwards and backwards.

I think I have recalled at least one N-REM dream but I wasn't LUCID

Today I was awakened at around 4:00 and I had the feeling I came from a disconnected dream it could have been an N-REM but I couldn't piece any of it back together, certainly I felt like I was awoken from a deeper sleep than I usually awaken from.

With LUCID I usually have total recall of it if I wake from it (if false awaken or lost and recalled not so) as soon as I wake I run thru the entire dream and time it to estimate the time. Of course when its 8 or 10 minutes long and involves 1+minute in the void prior to void survival and re-stabilizing, the estimate could be off by quite a bit. I'm sure I couldn't recall more than a brief out line of things I've done in the past 18 months in the real world and it would take me 18 months to time it out if I could go thru it second by second. So just as events from long ago can be fresh in your mind, or a series of events over time, your only remembering bits and pieces of time this is the same deception that people fall to upon awakening from a dream that transitions thru time. Even when I recall many segments of a dream (non-lucid) I don't assume I know for sure the order of all the pieces.