Okay, yesterday I unplugged it from the wall at 4pm EST. I played volume 8 music for ~15 - 20 minutes. Maybe 5 or 6 news requests, ask for a couple jokes and turned on/off a couple home automation devices. I t lost charge some time between 10 am and Noon giving it 20-22 hours with light use.
I will next play music at volume 6 or so and see what the duration is when I get a chance...