Unwittingly, last week functioned as something of a recovery week (14+ hours). I took two rest days, and another day with just an unusual single session ... as I felt so crappy after my shingles shot.
It did spark some serious reflections though. The previous six weeks I logged 15.5 hours of training per week, which averages out to an 800 hour, yearly training volume. And while I averaged 750 training hours last year, even that may be too big, and represents a non-sustainable training load ... aging is real.
So, for special occasions - prepping or doing an ultra, maybe traveling to far off mountains - a 15 to 20 hour week might be fine, however the norm for me should probably be a 13-14 hour training week.