Roche was unable to shorten the treatment duration in their ACCELERATE trial. 16 weeks of treatment with SOC saw lower SVR rates and higher relapse rates. As far as I know 24 weeks of treatment is the standard.
After analyzing ACCELERATE trial data, Roche announced back in 2008 that the European Commission has approved a shortened, 16-week course of treatment with SOC for certain hepatitis C patients (genotype 2/3 who have low virus levels before starting treatment, and who show a rapid virological response: