DS started getting simple math worksheets Monday-Thursday after about the 3rd week (?) of school. Then a few weeks later started books to take home and read to us, and now is getting word sorts and related word decoding "games". It has built up into a solid half hour of homework most nights if you include the reading, plus separately there is all the reading of books he actually enjoys that we do on our own. He gets through most of the math pretty quickly and it does seem to be a real review, not new work (which is what homework is supposed to be).