Hi all I'm averaging 8-9 hrs SOT, I've just started getting 3 days battery use, on my S21 Exynos version here in the UK, the highest SOT I've gotten is 13 hrs SOT. Great battery no complaints from me.
A new samsung will take about 2 weeks to detect how you use your phone and optimise the battery for your usage so play loads of intensive games and use a lot of video apps, if you do that when it learns your usage patterns your battery will be fine.