Management is one of those jobs that when things are going well, you may only need to be involved for an hour a day or less. When things are going pear-shaped,

Management is one of those jobs that when things are going well, you may only need to be involved for an hour a day or less. When things are going pear-shaped, then it's full on for ages. It certainly begs the question of "do we need managers", but the nature of the job is that it is lumpy in its time schedule to begin with. A similar question is: "What does my on-call engineer do the entire time they are on-call?"