I did switch from the glossy to matte display, which was a massive improvement for use on the go.
To be perfectly honest, I don't really know how much battery I would lose - the laptop is rarely untouched for more than a day or so and in the rare situations when it has been, it has been either completely powered off or left plugged in. I don't know if it's ever been in a situation where it was left in a sleep-state for multiple days.
It can take 10-20 seconds to boot up but battery drain while not is use has dropped to maybe 2% for any extended periods of non-use. As an 11th gen user, it exacerbates the CMOS problem I mentioned earlier but that hopefully shouldn't be an issue with the 12th gen mainboards.
This is a guide I've seen recommended: https://community.frame.work/t/guide-fedora-36-hibernation-w...
Hope that helps.