I can tell you my experience with Teams and Skype. My MSI Modern has AMD Ryzen processor, because such processor was kind of required by my school and so far it has been fast and nice. I've been able to stretch 12 hours by using Visual Studio and video calling on Skype for 10 hours, but I must confess something… One of the negative sides of MSI Modern has been the build quality, because my hinge broke out of the blue and they fixed it for free, but you know… The build quality isn't the best to be honest with you, but performance wise it has been great, but the story of the hinges has been rather negative. I've never dropped it or anything. It just broke. The Modern series has Creator Center and on Battery saving mode it has lasted me 12 hours (Visual studio, Bluetooth headphones and on WiFi using Teams for several hours), but I've also read stories like that:
https://www.reddit.com/r/MSILaptops/comments/ea43pd
I've never had it last on 3 hours of battery even when playing Civ 6.
I honestly wouldn't recommend it, because of the hinges breaking or I've been unlucky in that sense, because again, when you complain there are people saying: "Mine's fine" and then there are people that have gone through the same.
I'm not sure if AMD and Intel have different battery lives. Google claims that i7 one lasts still for 10 hours and based on my experiences, on that they have delivered on their promise, but the build quality is…yeah. It's almost a good laptop. Almost, but it's a lot cheaper than M1 MacBook Air 8GB (in my country it's $500 cheaper), so I guess you can't complain like that.
But because of the build quality I'd recommend you to look for something else. If you'll use it at home and don't close the lid then it's fine. Then again, keep in mind that I have always charged my MSI's battery to 80% and to 50% when I've been at home.