How many years of pre-service training? November 20, 2009

Prof.  Siddiqui, Chair of the National Council for Teacher Education (NCTE)talked about the development of new curriculum framework for teacher education in India that he hopes will be implemented nation wide over the next 3 to 4 years.
He says pre-service, in-service and professsional development of teachers must be considered as a continuum of teacher education.
He says there has been a shift towards a more constructivist approach to learning. He recognises a need to enhance language competence and a need to give space for teachers to become reflective practitioners.
Professor Siddiqui recommends a 2 years post graduation teacher training programme, or 4- 5 years for school leavers (after plus 2).
How many years pre-service training do you think teachers need?