Fly-by-night
Part of speech: noun
Definition: A creatures which flies at night; a nocturnal flier or traveler. One who departs or flees at night in order to avoid creditors, law enforcement etc. (often used attributively). Businesses that appear and disappear rapidly, or that give an impression of transience. Traveling businessmen and tradesmen.
Temporary
Part of speech: adjective
Definition: For a limited time, ephemeral, not constant; transient
Part of speech: noun
Definition: One serving for a limited time; short-term employee.
Example sentence: Once you agree upon the price you and your family must pay for success, it enables you to ignore the minor hurts, the opponent's pressure, and the temporary failures.