If I knew it was going to be over eight hours, not a chance would I trust it. If I don't use it then no problem, but then what would be the point of having a phone like the note? I'm on my third N8 and they all have had the exact same battery life, however the april/may security updates really stabilized it and has gotten better. If I unplug my phone at 7:30, buy 1 it's at 60%. All I am doing is listening to music through a BT connection, lots of texting and a few phone calls. Occasionally maps but not very often. gaming is the only thing that really hits the battery.
Another issue is the battery seems to be scattered on how it works, some people get excellent battery life, way better than what I get, but most seem to be about where I am. I also know that many who state they get excellent battery life tend to misremember the actual stats.