how many hours have elapsed since the first time patient 92788 was prescribed gabapentin during their current hospital encounter.
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 = 92788 and admissions.dischtime is null ) and prescriptions.drug = 'gabapentin' order by prescriptions.startdate asc limit 1