How much / what mine do varies by child.
Y9 ds does about 5 hours. He could do it in 3, but he’s slow! It’s 5 subjects a day, set by school. He only needs help occasionally, and so far I’ve been able to explain everything needed. I need to work on getting him to answer more in depth but he just wants to get it done rather than done well.
Y8 dd is very organised, works 8-12 and goes into more depth than school requires. I’ve only needed to give tech help.
Y3 ds is quite resistant to work! He does 30 minutes of times tables, education city and reading plus websites, plus the occasional oak academy. I’m mostly working on getting him to sit and do it, and managing his tantrums. He also FaceTimes friends regularly.
Summer born Y2 ds was (is) hugely behind on reading (previously had help for speech too) so can’t work independently at all. He doesn’t like the websites y3 ds uses, so only occasionally does them, and says bbc bitesize and oak academy are for babies (think it’s the teaching style). He does 3 days of maths worksheets if I’ve been in work (nights) as he can do those well once I get him started. Other days it’s either 1 English worksheet (all he can do as he finds more very stressful) or reading a chapter book with me (he reads a page, then I do). He’s definitely got better at reading: he was on stage 4/ red Oxford books before this! Obviously, his y3 brother who loves reading thinks this is hugely unfair, so tantrums ensue...
I’m not doing too well with all this. It’s a combination of having to divide my attention between 4 dc at very different stages, working nights in hospital and dh being in work/ wfh. I’m just aiming for the eldest 2 to keep up, the 8yo to improve his behaviour and get something done and the 6yo to learn to read/ get enough confidence to read his worksheets. Not great, unfortunately!