4. The method according to claim 1 further comprising: mapping said duration score to a grade; and presenting said grade to a student.
5. The method according to claim 4 wherein the step of mapping said duration score to a grade comprises: collecting a set of training speech samples from a plurality of language students of various proficiency levels; computing training duration scores for each of said training speech samples; collecting at least one human evaluation grade from a human grader for each of said training speech samples; and adjusting coefficients used in mapping by minimizing an error measurement between said human evaluation grades and said training duration scores.