Self life of volumetric solution

Any procedure available for how to determine self of volumetric solutions like 0.5N NaOH, HCl etc.?

After standardisation of solution do the analysis daily and note down the normality for one month to 45 days . The normality of solution should not vary 2%. if it decrease or increase after 35 days give shelf life of 30days.

Make 3 trials or 3 repeats

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