Enzyme E (at a starting concentration of 0.2 mol L-1) catalyzes the transformation of reactant S (the substrate) to product R according to Reaction 1: S + E --> R + E (Reaction 1) It is known that there are 3.2 molecules of S converted to product per minute over a single enzyme molecule when the enzyme is saturated with the reactant S. The initial concentration of S is 17.1 mol L-1. If the reaction is occurring in an isothermally operated constant volume batch reactor, what is the time, expressed in minutes to one decimal place, that is needed to reduce the substrate concentration down to 3.5 mol L-1?