But no good student who approaches the grad school process in a sane manner is going to work for a professor whose students stay there for 12 years and don't gr

But no good student who approaches the grad school process in a sane manner is going to work for a professor whose students stay there for 12 years and don't graduate. A common thing for deciding if you want to work with someone is seeing how long their students took to graduate, where they ended up, emailing them, etc.