Instead of 27 hours on tower guard duty, he's reading Arthur's Back to School Day.

他终于可以不用在瞭望哨里面值勤27小时了，而是手捧阿瑟的《回归学校的日子》，美美地阅读起来。

youdao

A large number of security personnel are on duty 24 hours to guard and protect the line.

一批大量的保安人员24个小时值勤守卫和保护线路。

youdao

All key employees to cancel leave, customer service, technical support on the basis of the existing 724 hours on duty, increase the duty officer;

所有重点岗位员工取消休假，客服、技术支持在现有724小时值班的基础上，增加值班人员；

youdao

A hospital was not supposed to require more than eighty hours of duty in a week.

VOA: special.2010.07.13

So the I.O.M.proposed that residents be required to get five continuous hours of rest for every sixteen hours on duty.

VOA: special.2009.06.02

So the Institute of Medicine proposed that residents be required to get five continuous hours of rest for every sixteen hours on duty.

VOA: special.2010.07.13

Drinking within 10 hours of being on duty will be banned, as will allowing foreigners into hotel rooms, with the exception of hotel staff and official counterparts.

BBC: Secret Service Colombia scandal prompts new rules

Yes, it is probably the case that if you have a kid playing Call of Duty for six hours at a time, he might come out of the other end of that acting a bit more aggressively.

FORBES: Biden Says Not to Fear the Facts About Video Game Violence

Several hours later two of us managed to get off duty to go over and see our room.

NPR: Kate Nolan, WWII Combat Nurse