instruction: in this hospital encounter how many days have passed since the last fever - etiology unknown diagnosis of patient 006-202970?
response: SELECT 1 * (STRFTIME('%j', CURRENT_TIME()) - STRFTIME('%j', diagnosis.diagnosistime)) FROM diagnosis WHERE diagnosis.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '006-202970' AND patient.hospitaldischargetime IS NULL)) AND diagnosis.diagnosisname = 'fever - etiology unknown' ORDER BY diagnosis.diagnosistime DESC LIMIT 1