Your question is Designing an Experiment. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
How would you setup an experiment? estimate the length, sample size, etc.
Asked in the onsite stage. Keep the answer focused on how you would define the test, estimate runtime from traffic, and decide whether to ship.