My dad was getting 6 hours out of his at about 14 watts. but he was chain vaping it to take care of his smoking desire.
I will note this though, my dad plugged in the charger, or I should say tried. The charging port pushed in. Taking the bottom off, looks like the way it's soldered is very minimal. It'll be interesting to see how it's taken care of with warranty. If they don't do anything, then I'll try and solder it myself. I've been reading a few people have had this problem with them. Hoping the new one lasts a while.
Coils, 2 weeks with 18mg unflavored nic base at 60vg/40pg and all seems great with it still.
I had to go buy my dad a new one at the local shop. 30 minutes after his charging port got pushed in and his battery died he was going crazy needing to vape or a cigarette. So he had to use my Reo, wish isn't easy to explain squonking to him haha, until the new eGrip was charged. $65 including tax is worth it if he stays off cigarettes. 3 packs a day down to none in the last 8-9 days or so.