For a 24 hour urine test, is one supposed to collect ALL the urine in those 24 hours or just a little bit every time we go?

See below. On day one, go pee in the bathroom at 8am. After that collect all the urine in the container provided to you. On the second day pee in the container at 8 am. And that way you will collect 24 hour urine. Collect all the urine during the 24 hour period as described above.