How much is a lot?

Pop quiz, hotshots: let’s say you’re a collector of aerospace history documentation. And for reasons that seem good at the time, you start stuffing it into boxes 15 by 12 by 10 inches, averaging thirty to forty pounds per box.

How many boxes before you say, “that’s a good collection,” how many till “whoa, that’s a lot,” and how many till “you have a problem?”