Answer:
I make things short but I am pretty long myself
I'm a kind of cup that doesn't hold water, but makes a lot of noise repeatedly. What am I?
Whoever makes it tells it not. Whoever takes it knows it not. Whoever knows it wants it not
I contain five little items of an everyday sort. You can find all five in a tennis court.
Sometimes I fly as fast as the speed of light. Sometime I crawl as slow as a snail. Unknown until I am measured but you will certainly miss me when Iām gone.
No matter how little or how much you use me, you change me every month.