It would depend on the dose you took how long you would have to wait before using Miracle-Mineral-Supplement . but it would perhaps be at its lowest in the plasma after about 4 hrs(less than 1%).
How much it would affect Miracle-Mineral-Supplement before then I don't know. Maybe not hardly at all even after only 2 hours when perhaps about 5% would be left. So maybe you could take small amounts of vitamin C an hour of two away from Miracle-Mineral-Supplement throughout the day without reducing its effect too much, but you need to allow time for the MMS to work also so you could be cutting this short if taking more than one MMS dose a day.
Thats why I take it at night and the C in the morning. you could then take another dose of MMS at midday if taking 2, or more C if not. Three MMS doses is more tricky