My Y8 and Y10 DC (indie school) have a 5 lesson daily timetable, so 25 hours per week, but they also have 2 digital assemblies and an hour of "classroom" time, plus a school wide quiz weekly. In addition, particularly for my Y10, she has 'free' lessons for subjects she's not taking.
They're both keeping up with the work set, there's definitely more for the Y10 than the Y8, and it's being marked with useful comments on a regular basis. Everything is set via Google Classroom, which I've now infiltrated, so although I don't so much supervision throughout the day (DH and I are both working), I check in periodically to check they're up to date and to follow up on how they're doing, what their marks are, and if they've got anything outstanding. This has definitely helped with my Y8 DC, as he had started handing blank work in
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After half term, they'll have exams as normal (although I don't think they'll be as challenging as normal). I think our school is doing an amazing job, and let them know whenever I need to get in touch. They got up to speed with Google Classroom before lockdown (some children left school earlier to shield family, so they needed online resources), and have gone from strength to strength, and kept us really informed with regular updates of what they were doing as a school (daily at the beginning). We've now been asked our opinions on returning to school by way of a survey, and they;'re taking parents' opinions into account when formulating next steps.