How intensive is the process of interviewing people for faculty openings?
Edit: This answer applies only to the US.

For me, the typical case seemed to be:


Day 1: Fly in mid-afternoon. Meet your faculty host and 3-4 faculty members for dinner where you have informal discussions about research, the university, or anything else.
Day 2: This is the main day. The day lasts from about 8am until about 6pm. You give your 1 hour talk, interview with about 6 different members of the faculty (sometimes more if the meetings are in groups), have lunch, meet with graduate students, meet with the dean, and meet with the chair.  After 6pm, you usually get taken to dinner with 3-4 more members of the faculty.
Day 3: Sometimes you'll have breakfast with your host, sometimes not.  Then you fly out.


It also wasn't so different for research labs.  Just replace "faculty member" with "research scientist."

I'd say that these visits aren't any longer than a prospective Ph.D. visit, but much more intensive.  Also, Ph.D. students usually visit after being admitted, whereas faculty members visit to interview.