My 78 I just received lasted my 30 min drive in 30 min home of continued vaping. Also got another 30 mins at home. A hour and a half isn't bad at all.
It is for me still a little awkward for hands free use but much better than a 650x2.
You must be a heavy vaper like me. I recently saw a review from pbusardo on the 65mm and he got 4 hours of vaping on as he said "his normal vaping".
When I saw that, I was like "wow, I must be a bad chain vaper". I usually take 3-4, five to six second vapes every minute.
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