Types of academic supervisor
Lab sciences
In my fourth-year review he referred to a method I'd abandoned eighteen months earlier. The postdoc did the actual supervision and left for industry that year.
PI last, senior postdoc first if she touched it. I found out when fourteen months of my work came back with me third. Two students left in the following year and a half.
Six students, median submission around six and a half years. The department publishes 4.1; that's the ones who finish.