“A few minutes” seems… reasonable? Like, you can let it run for a few hours on a list, come back in the morning, see which combos work. You ship it out once a month, it’s gotta be quicker than testing them by hand.
If I'm reading it right, that's a over a minute for only 4 candies.The "boxes" there isn't a per-customer shipping box, but the virtual boxes representing candies.
Yes, understood, but you’re going to ship out a maximum of fifteen or so candies or the economics doesn’t work. Even with really awful scaling, the fact you have an entire month to prepare and send the next shipment gives you a lot of computing time.