I have both sides, dd is 3 and a half and at the nursery class in our local tiny school so does afternoons with the reception class. She "reads" to the teacher twice a week, just nursery rhymes, following the words with her fingers but loves books so much that she's started the reception books at the same time with me at home. She also recognises some letters and can count to 30 and has started number bonds to 10. None of this is pressure from me, she just loves "doing"
I have to say she also loves painting and drawing, playing outside and all normal toddler things. I take it from her and will do as much or as little as she wants. I remember being able to read many words when I started school at age 4 and apart from a couple of years of being a rebellious teenager will devour books.
As a secondary school maths teacher however it "does my head in". We keep discussing as a school to reward hw done, not punish those who don't as these kids generally can get one to one tuition during a detention on a topic they can't be bothered to do at home. I see hw as vital to see how much they undertand on their own and also think if they do it with parents they always have a detailed example to help explain and if they can teach a method to their parents the concept will stick. I did spellings and times tables as well as reading throughout primary school and remember my dad shouting 7 x 8 to me in the car and Mum saying "she's only 5!"
Throughout this waffle what I'm trying to say is that hw at primary level should be set a couple of times a week but reading should be every night, and at secondary find out from the school the time that is expected for each subject per week and have a set time to do it. BTW I leave at 7am and get home at around 5 so no late start early finish and I bring marking and planning home each night and at weekends.
Kids who are young are generally excited by everything, if we don't make hw a chore but fun as parents, perhaps we stand them in good stead for the future! That's my idealistic view, I'll get back to you when dd has 3 projects and 2 essays due in at the same time!