how many days have it been since the last time that patient 73713 stayed on this hospital encounter in careunit sicu?
select 1 * ( strftime('%j',current_time) - strftime('%j',transfers.intime) ) from transfers where transfers.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 73713 and admissions.dischtime is null ) and transfers.careunit = 'sicu' order by transfers.intime desc limit 1