SCHEMA:
CREATE TABLE table_name_4 (length VARCHAR, composer_s_ VARCHAR, arranger_s_ VARCHAR)
USER:
What is the Length, when the Composer(s) is Sakdatorn, and when the Arranger(s) is Jitrakorn Mongkoltham?

QUERY:
SELECT length FROM table_name_4 WHERE composer_s_ = "sakdatorn" AND arranger_s_ = "jitrakorn mongkoltham"