If anyone is interested, I've been using my 16" M1 Max with my typical daily use (mostly Safari and Mail, a little bit of PS and Capture One here and there, Apple Music in the last hour, Messages, etc.) and I'm down to 67% with over 9 hours usage on the battery. The keyboard backlight is on its lowest setting without it being off and the screen brightness setting set at 5 for the first few hours of the morning when it was dark and up to 7 for the rest. Bluetooth was on. It did go to sleep a few times but not for long. I've been on it for most of that time. Hope that helps.