what was the total amount of output for patient 25814 since 775 days ago?
select sum(outputevents.value) from outputevents where outputevents.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 25814 ) ) and datetime(outputevents.charttime) >= datetime(current_time,'-775 day')