How long can you store urine to use on a pregnancy test?

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I was wondering if anyone knows how long first morning urine will be good stored in a cover cup to use on pregnancy tests.
I need to store it because first morning urine has the highest concentration of HCG. If you pee later in the day, it won’t be as concentrated. I just need to store it long enough to be able to run to the store. I know that you can store and have it be good for something like 24 hours but I wasn’t sure. I guess you guys don’t know. I will try looking somewhere else.

why would you need to store it? just wait until you are able to pee on the stick yourself
um, about 20 seconds.