By systematically applied pair work in language education, the talk time of the individual are multiplied.
If a class or a seminar with 30 participants trained for 45 minutes a language. Then you come to an average talk time of 1.5 minutes per participant, was that without the instructor to speak.
But if 30 minutes are organized in pairs, each participant comes to 15 minutes of talk time. And for another 15 minutes for presentation by the seminar leader.