Question: What is the total number of years active listings where Asian Cup played as a captain is Japan 1992?
Schema: create table table_272865_20 (years_active varchar, asian_cup_played_as_a_captain varchar, PRIMARY KEY (years_active))
SQL: select count(years_active) from table_272865_20 where asian_cup_played_as_a_captain = "japan 1992"