Hi Thanks for the query to H C M . You mentioned only one thing that you are having heavy 7 prolonged bleeding. Scan shows tiny follicles and no pcod. Duphastone i.e. dydrogesterone 10 mg is advised in many cases like miscarriage, threatened abortion , infertility endometriosis , menstrual disorder. As in query , you asked how long does it take time to stop bleeding . Till , we don t knwo the disease , you are having. All the dose , duration of drug depend on for which disease , indicated . I am giving an example. In miscarriage 10 mg twice in day given cyclically until conception. Hope this will provide you good information . Further if any question I will reply . Good luck.