instruction: how many hours have elapsed since the first time patient 808 stayed in careunit sicu in this hospital encounter?
response: 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 = 808 AND admissions.dischtime IS NULL) AND transfers.careunit = 'sicu' ORDER BY transfers.intime LIMIT 1