how many days have passed since the first time that patient 97330 has received a red blood cells laboratory test in the current hospital encounter?
select 1 * ( strftime('%j',current_time) - strftime('%j',labevents.charttime) ) from labevents where labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'red blood cells' ) and labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 97330 and admissions.dischtime is null ) order by labevents.charttime asc limit 1