how many hours have passed since the first time that patient 96833 was prescribed acetazolamide sodium during their current hospital visit?
select 24 * ( strftime('%j',current_time) - strftime('%j',prescriptions.startdate) ) from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 96833 and admissions.dischtime is null ) and prescriptions.drug = 'acetazolamide sodium' order by prescriptions.startdate asc limit 1