I noticed this:
On wilderness time units:
"While exploring the wilderness the GM uses 6 hours long units of time called quarters of the day."
On spell casting:
"you must rest uninterrupted for 8 hours to regain that ability."
What about making spell casting recovery require a quarter of time (6h), that way it aligns?
Also, I see that "resting" is described in adventure site exploration, risking the Exhausted condition. But, there is no mention of sleeping once per day vs Exhausted condition? Are consuming rations required as well to avoid being Exhausted?