how many days has it been since the first stay of patient 17462 in the careunit tsicu on the current hospital encounter?
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