how many days has it been since the first time patient 12726 stayed in the careunit micu on this 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 = 12726 and admissions.dischtime is null ) and transfers.careunit = 'micu' order by transfers.intime asc limit 1