It stops every so often, like once an hour maybe? Sometimes it just stops, sometimes it gets stuck I think.
When it continues with my encouragement, it will output sentences or paragraphs quickly, but within minutes it will chug slowly at output less than a word per second.
7 hours later, it's summarizing chapter 5 (out of 20-something I think).
While checking it periodically, I learned about the https://en.wikipedia.org/wiki/Persian_Cossack_Brigade