[Speaking from my experiences as a PhD student] once an academic is sufficiently senior they can do what they damn well like. My boss came in late, took long

[Speaking from my experiences as a PhD student] once an academic is sufficiently senior they can do what they damn well like. My boss came in late, took long lunch breaks, and went home early. Back to the topic: if he received papers to be reviewed, he gave them to his post-docs.