I think you need to remember he is sponsored. Hence the signing of the coffee machine and the fact it was in his hotel room at all.
I think 1 per day is a baseline people would think of, so 10 - 14 seems pretty reasonable. The other thing is you're guessing 'How many coffees the Z6 made during the two week tournament' not how many Rodger drank. He could have not had any, but made 30 shots on the first day because he knew he needed a number for this competition. He could have made 8 cups on a single day if he had the coach+support staff in on one of the days to discuss anything (I doubt you'd do this in the hotel room but who knows)
Im still thinking through what I'll put down but seems like a good starting point.
"Entries will be judges based on the nearest correct answer as well as their originality and creativity. Good luck to all the entrants!"
Pretty weird/funny thing to guess. I would think that a pro athlete wouldn't drink so much coffee as to stay healthy? But I might be wrong. Also wonder how much time he would've actually spent in his hotel room as opposed to going out for coffee and whatnot.
Anyone willing to share what they've guessed?