how many hours has passed since the first time patient 8888 visited careunit tsicu on this hospital encounter?
select 24 * ( 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 = 8888 and admissions.dischtime is null ) and transfers.careunit = 'tsicu' order by transfers.intime asc limit 1