What does it mean to "only use the faucet on the long term"?

For example, the hard limitations imposed by the system is that one can use the faucet at most 15 times a day, claiming 300 satoshi each time, and two requests must be at least a few minutes apart.
This is a a concrete and unambiguous statement.
Can you give a similar concrete explanation for "only using the faucet on the long term"?