Also note that this heavily depends on the CPU and screen configuration (LED or OLED).
One data point here: My laptop with an AMD 7840U with FHD+ IPS screen could last 9 hours in my own testing, that's without video calls or heavy multitasking. It's a ThinkPad but there are a few on the market with the same APU. A similar test on an Asus laptop with i5-1240p high-res OLED would yield 5 hours using the same method.
I know, it's annoying that there is no easy way to get a somewhat realistic estimate of the battery life on Windows laptops, while official Macbook battery life in the specs is reasonable and often accurate. Generally, you would want to get a low voltage CPU and avoid OLED screens if you want good battery life.
A newer Microsoft surface gives you 13-16 hours depending on the model and HP, Dell and Lenovo have slim-ish laptopts in the 11-14 hrs range
I'm incredibly happy with this laptop in general.