The validation is a bit tricky bc it requires some "joins" or lookups. btwn 3 different arrays. The first requirement took me ~35 minutes, and i panicked a bit when i was halfway thru the interview and hadn't finished the first item. But the next 2 validation requirements took only 5 min apiece, and the next 2 about a minute. So that left one unmet requirement, which i could have finished in another minute. I am a bit miffed bc the session started 5 min late bc the audio wasnt working properly.