My experience was 6 days; but I was adding a drop or 2 each day.
If you are following the guidelines and keeping Miracle-Mineral-Supplement away from ascorbic acid, you should experience reactions soon. It may also have to do with how healthy you already are. If you intend to stay at 2-3 drops, you may not have much of a reaction; but may still benefit from Miracle-Mineral-Supplement .
MMS is a destroyer of microbes; so it may not be reasonable to expect improvement in blood. However, Miracle-Mineral-Supplement may correct something else in the body that keeps your platelets from improving. After all, the immune system will have a clearer path to be able to help you.