Duration 2 weeks 3 weeks 4 weeks (1 month) 5 weeks 6 weeks 7 weeks 8 weeks (2 months) 9 weeks The minimum duration for a language course is usually two weeks, but students benefit the most starting from the 3rd and 4th weeks of their language course, after they get used to the new environment. By this time, the early distractions are over and the student has "settled in".