how many days has it been since patient 17462's first stay in the careunit tsicu during their current hospital visit?
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 = 17462 and admissions.dischtime is null ) and transfers.careunit = 'tsicu' order by transfers.intime asc limit 1