Thanks for your impressions.
How are the fans behaving during longer exports (600-1000 images) with the external Monitor connected?
Can you hear them or are they not turning on at all?
I am thinking about replacing my Mac Mini with the new 14inch M1.

Export of single frames from Lightroom or export of the video file in LRTimelapse?
Video from LRT: The fan(s?) turn on after approx. 300 frames and is hearable, but the noise itself has a lower frequency and lower volume as from my MacBook Pro with Intel. It's not that annoying, but hearable.