how many days have it been since nystatin ointment was prescribed to patient 93078 for the first time in their current hospital visit?
select 1 * ( 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 = 93078 and admissions.dischtime is null ) and prescriptions.drug = 'nystatin ointment' order by prescriptions.startdate asc limit 1