How long did Elly Koss have to take Acetaminophen 160 MG?
how long = SUBTRACT(julianday(medications.stop), julianday(medications.START)); Acetaminophen 160 MG refers to medications.DESCRIPTION = 'Acetaminophen 160 MG';
SELECT strftime('%J', T2.STOP) - strftime('%J', T2.START) AS days FROM patients AS T1 INNER JOIN medications AS T2 ON T1.patient = T2.PATIENT WHERE T1.first = 'Elly' AND last = 'Koss' AND T2.DESCRIPTION = 'Acetaminophen 160 MG'