The 30 to 60 second rule is for using it before you dilute it. When you activate the Miracle-Mineral-Supplement with the weak acid and wait 3 minutes, it is too strong for the skin or internal use. You must dilute it with juice or water.
For burns, and such problems as yours. You could use it before you mix it with water; but you must wash it off very soon. It will burn your skin. If you are going to use it as a soak, you should dilute it with the water. Then you can leave it on much longer.