21:44 At the beginning of 2011, Macklemore Corporation is considering the acquisition of Blue Sky Learning (BSL), based on BSL's actual financial data for 2010 and its projections for 2011 to 2015, as shown above. Macklemore's WACC is 8.0%, BSL's WACC is 11.5%, and the average of the two companies' WACCs, weighted by sales is 8.2%. What is the value of BSL's equity (in $ millions) at the beginning of 2011, assuming that at year-end 2015, the company's equity is worth 15 times earnings after tax and its debt is worth book value. W