The Sync function no longer shows a progress screen, and does not revert back to the watch screen.
I just got my Fenix 5 Tuesday this week and charged it overnight, so I started using it wednesday 25th of june at 6 AM. Since I have been wearing it 24/7 except when in the shower and I had a 35 min run thursday evening (GPS+Galileo). Running stock watchface and right now 30th of june 8.20 AM the watch is at 56%.
I have been playing around with the watch to check out th functions so probably have a higher than normal use duirng these first days.0
I don't know when but the watch autoopdated to 13.30 (I discovered it yesterday morning) and took at photo of the watch showing 67% at 6.40 AM on 29th of june.
So the watch drained 13% in a little over 24 hours. Not too bad on the first charge i believe.