Honestly, the issue is that what is 'typical' is not necessarily healthy. Children in the UK are particularly sedentary, and most kids, including mine, have become more so in lockdown. Similarly, we are one of the most overweight and heavy-drinking nations in Europe (and the world), so whenever someone posts about what is reasonable drinking you get a ton of people saying how they put away a bottle of wine a night (ok, and some very righteous people saying they drink a thimble a month and that any more make you a problem drinker). What's considered normal on MN isn't necessarily healthy.
I have family in Asia and Scandinavia, and screen time norms at our London state school horrify them. Friends who work in tech in the US are also far more restrictive with their own kids, despite marketing products to other peoples'.
We try to strike a balance - my eldest and a middle child are just a bit younger than yours, I have a few hours of screen time a day on the weekend, often they watch a movie one day and then have a big Minecraft session the other, and then during the week they are allowed to have 2 hours of screen time (for the eldest) and 1 hour (for the middle one) at their choice, so if it's all done on Monday it's done, or they can spread it out. They can sometimes get some extra for doing something lovely, or just because I want to show them something cool or they want to share something cool - I try to make it more collaborative instead of sitting alone.
During lockdown I've had to relax a bit more to allow for work and homeschooling, and because for the eldest, gaming was a social time, but I think they've had enough of screens for a long time, and really need more time.outdoors and to play in person with others.