How many oxidation-reduction steps are involved in going from glucose to two pyruvates?

Glycolysis, the initial stage of glucose metabolism, takes place in the cytosol and does not involve molecular O2. It produces a small amount of ATP and the three-carbon compound pyruvate A set of 10 enzymes catalyze the reactions, constituting the glycolytic pathway, that degrade one molecule of glucose to two molecules of pyruvate. A set of 12 oxidation and reduction reactions take place in the conversion of glucose to two pyruvates.

Most smaller stars don't have a radiative zone.