The best candidates would have that question wrapped up in 5 minutes. Like they're not even having to think about it, which is honestly all I cared about testing for -- do something really easy really fast so I know you're not BSing me, and then we can move on to just having a conversation about your past experience.

One of the worst guys took 20 minutes, with me having to coach him through it the entire time. It was a true exercise in patience, but I don't mind helping people learn new things. When he got his rejection email, he actually complained to the recruiter because he thought he did really well. Dude...