Nope not at all.
My 7 and 8 year olds are doing an hour a day.Kids differ as do schools.If you're fortunate to have swotty kids attending private schools who excel at everything then I guess you don't need to do anything.
If your kids go to mediocre schools and have areas they need to work on the long summer hols are waaaaay better than trying to do stuff during term time.And seriously I really don't think an hour out of a day is hardship by any stretch of the imagination.
My son is a leftie and needs all the writing practice he can get,dd has crap confidence in maths so we're working on core skills to boost her confidence-it's a no brainer as far as I'm concerned.
I've bribed mine with a footstep chart off Netmums,they colour in a foot every time they do an hour without moaning,distracting others.If they do a fab piece of work they get an extra foot.15 feet then it's a reward.We're doing Summer Journals,work books and they read loads anyway.
They're having a ball.So far they've camped in Cornwall for 10 days whilst spending the majority on gorgeous beaches(wrote postcards,journals on the odd night),gone wild camping on the moor this weekend,been to the library heaps,the park,constantly out on their bikes doing time trials,reading comics,woods,rivers,playdates.....
It's an hour a day folks with 1:1 attention not slave labour and it's a whole lot better than being on an XBox.