He'd be in the classroom from 8 ︰ 00 in the morning to 10 ︰ 00 at night, teaching 10 classes in a single day, and then he'd often chat with the students until 1 ︰ 00 or 2 ︰ 00 in the early morning.
早上八時開始上課到晚上十時，一天十堂課，常常還陪學生聊天聊到凌晨一、兩點。