Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_203_589 ( id number, "protein" text, "natural host" text, "normal function" text, "prion state" text, "prion phenotype" text, "year identified" number )

### Question ###
how long after the third prion characterization would it take for another to be characterized ?

### Accurate SQL ###

SELECT (SELECT "year identified" FROM table_203_589 WHERE id = 3 + 1) - (SELECT "year identified" FROM table_203_589 WHERE id = 3)