老师唠叨比嚼炫迈时间还久
[lăo shī láo tāo bĭ jiáo xuàn mài shí jiān hái jiŭ]
A humorous way to say 'The teacher nags longer than chewing Xiangmachi gum'. Xiangmachi is a famous brand of gum. It uses hyperbole humorously indicating that either teachers speak too much or that the speaker doesn't like listening to their lecturing for long hours.