Honest question about screen time limits - what's actually realistic?

Got two kids, ages 7 and 11. Wife wants to limit it to 1 hour per day total but ngl that seems insane on weekends when we're trying to get stuff done around the house. What's actually reasonable here? And how do you guys enforce it without constant battles? I'm not trying to raise them glued to a tablet but I also don't want to be the 'no fun' parent, you know?