At secondary level, the Government recommends that the time spent on GCSE coursework should fall within 1.5 - 2.5 hours per day (Years 10 and 11)
A copy of the leaflet "Coursework: a guide for parents" is available to download from the QCA web link shown below. If this is not what you are looking for or if you want more information you can contact the Department by email at info@dcsf.gsi.gov.uk or telephone on 0870 000 2288.