Hospital staff nurses work in these, & a recent study shows that nearly half of them exceed 12 hours
Despite recommendations that work shifts not exceed 24 consecutive 
hours,... [DOC] [TLE] The Effects of Fatigue and Sleepiness on Nurse Performance - NCBI [PAR] More recent studies, however, have shown that the 12-hour shifts favored by 
many ... on duty, reduced sleep times, and nearly triple the risk of making an error
.,,.