This is a home grinder, usually grinding for an espresso last less than 30 seconds, it will have time to cool down, no issue there Many grinders like the Niche have a similar on/off switch.

Thank you for your detailed answer. Obsidian Markdown Export makes most of what I need: it created a new note, and transcluded page are copied. So with minimal editing I get what I need. I can merge all the notes of one month in one doc, tidy-up and done. Good opportunity to review note at the same time.

Lot of info too here in this long thread at head-fi (here) from Jason Stoddard, founder of Schiit.