Thank you for contacting us and letting us know your issue.
We understand that your note 8 is quick charge enabled. To maximize the charging speed, you need a battery which supports the same technology.
Although we haven't tested this battery with your note 8, as this battery supports quick charge 3.0, it should charge your phone as fast as your Samsung original wall charger. As far as I know, it takes 1 hour and 47 minutes to fully charge your phone with OEM wall charger. The charging time from this battery should be almost the same. We are so sorry to say that we do not know how long it takes to charge note 8 from 0-80%. So sorry for the inconvenience and we appreciate your understanding.