Loosely related, how do you pull this off? Given that interviews effectively take up whole days, I feel like it'd be really tough for me to routinely work four day weeks and everyone at the office be OK with it.
One perk of my current gig is a very high level of flexibility (I'm in the actual office maybe 15-20 hours per week, and work from home or coffeeshops the rest of the time), which makes this much more viable.
Really? I find they are either an hour in the office or a few 30 minute phone calls. At least in tech. I know in other fields they have all day group interviews with lots of team building stuff but I haven't encountered that in tech (well at least with startups).