Figured I'd post this here for any potential buyers who are curious. Just my sample size of one person and one watch, having now had it for two charge cycles. My watch arrived with 3.20 preinstalled and at its first sync it installed the updated WHRM firmware.
The second cycle seemed to last a fair bit more than the first one. I hit 12% battery today at a five full days (120hrs) since charging to 100%. Everything on, stock watch face except when I'd switch to SR6 to check battery percentage, and three outdoor runs totaling 110 minutes of GPS time. I've not turned on GLOSNAS.