This Nenso is Limited Edition, aka deep cryo immersion treated for a week, so you guise need to factor that in. You have to take the stock burn in recommendation hour count and add: [negative temperature (-1)(-330? to about -345? ) multipled by the number of hours immersed (48+ hours)] and then you get your final optimal plateau in the Nenso Burn In Curve. ~85000 hours+
The 7000+ hr Nenso LE was quite upper-mid prominent, somewhat "bright" with "feathered" edges around notes from mids up, a bit edgy and fatiguing all around and lacking in the clean/clear/smooth highs, transparent "window", separation/definition/dimension to instruments, deep/impactful/authoritative bottom end, warmth and more lifelike presentation of the 84000+ hour Nenso LE prototype.
With normal burn in of Nenso LE, the youngling blossoms into a real reference level protable gem. On the 31338th hour, there is a bit cleaner, clearer, more "transparent", has greater impact, more distinct separation/delineation of performers and instruments, and better description of the shape/physical volume/material of instruments.
Only after the extra burn-in hours to compensate the freeze-in side effects of cryo treatment will Nenso LE mature into the tiniest gem that he is capable of being. Upon post-procedural audition, one finds a complicated/textural hint of juniper in the upper mids, as well as a remarkably layered imaging, lucidity through the extended highs, excellent weight&body to instruments, most complete/complex waveforms for the most complete notes (drums sound most like real drums, as do cymbals, wood-bodied instruments, stringed instruments, etc., etc.)
The area of improvement from complete burn-in that is most striking is the erasure of Nenso LE's lack of warm and "body" to vocal throat and chest resonances; it was as if through extensive burn-in, the "boy" matured into a "man."