List the longest duration of absense for a student enlisted in the fire department.
longest duration of absence refers to MAX(month); department refers to organ; organ = 'fire_department';
SELECT T1.month FROM longest_absense_from_school AS T1 INNER JOIN enlist AS T2 ON T1.name = T2.name WHERE T2.organ = 'fire_department' ORDER BY T1.month DESC LIMIT 1
database name:db_id student_loan
bool table bool Cols: name dtype text, 
person table person Cols: name dtype text, 
disabled table disabled Cols: name dtype text, 
enlist table enlist Cols: name dtype text, organization dtype text, 
filed_for_bankruptcy table filed_for_bankruptcy Cols: name dtype text, 
longest_absense_from_school table longest_absense_from_school Cols: name dtype text, month dtype integer, 
male table male Cols: name dtype text, 
no_payment_due table no_payment_due Cols: name dtype text, bool dtype text, 
unemployed table unemployed Cols: name dtype text, 
enrolled table enrolled Cols: name dtype text, school dtype text, month dtype integer, 
