for me, at least, one interview process being 9 hours isn't a big deal and i agree with you that a company doing that is likely to have a more coherent culture and make smarter hiring decisions.
the problem is that when the job market isn't too hot, you might be applying to a dozens or even a hundred+ positions. if 5-10 of those all have 9 hour processes, well now you have 1-2 full weeks work of unpaid interviewing to do, which is a lot to organize, prepare for, etc.
the problem is that when the job market isn't too hot, you might be applying to a dozens or even a hundred+ positions. if 5-10 of those all have 9 hour processes, well now you have 1-2 full weeks work of unpaid interviewing to do, which is a lot to organize, prepare for, etc.