It is :) I work on the internal team now, but was interviewing for about a year in 2016 while working on my own business. If you have any questions about what interviewing is like I'm happy to answer!
Can you describe the process of assigning interviews to interviewers and the process of choosing times for the interview sessions?
If I wanted to set aside a time period of say, 8 contiguous hours every week, during which I wanted to do as many interviews as possible, how many could I expect to be able to fit in?
Sure! Basically: You put availability on your calendar; we book interviews into that availability. (When candidates schedule, we show them aggregated availability across all eligible interviewers.)
You could do roughly 5 interviews in 8 hours if you account for breaks and everything. It's possible to do more than that, but I'd say that's the happy fill rate. I've done more than that and it starts to be excessive.