How long does a strong positive ovulation test turn weak positive after?

Patient's question:

Sure, here is the translation of the content you provided:
No

Doctor's answer:

Hold the test paper with the arrow mark end dipped into the urine for about three seconds, then remove and place it flat. Observe the results after 10-20 minutes, with the result to be read within 30 minutes. The liquid level should not exceed the MAX line.