Working full day

Have to work full day today. Andy is back in National Service for two days. No, he is not after Form Five student. He is there as a trainer. And he is called up to teach the trainees in the camp three times a year. Or in this case, he is called up because there are not enough trainers to teach the syllabus. And when he is not around, I would have to work full day. It can be very tiresome.