The purpose of this study was to determine the amount of time elementary and middle-school students spend away from the classroom and clinic time required to administer vaccines in school-located vaccination (SLV) clinics. We conducted a time study and estimated average time away from class and time to administer vaccine by health department (HD), student grade level, vaccine type, and vaccination process for SLV clinics during the 2012-2013 school year. Average time away from classroom was 10 min (sample: 688 students, 15 schools, three participating HD districts). Overall, time to administer intranasally administered influenza vaccine was nearly half the time to administer injected vaccine (52.5 vs. 101.7 s) (sample: 330 students, two HDs). SLV administration requires minimal time outside of class for elementary and middle-school students. SLV clinics may be an efficient way to administer catch-up vaccines to children who missed routine vaccinations during the coronavirus disease-2019 pandemic.