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My understanding is that the human body stores magnesium, said stores sufficient for approximately 30 days. As such, daily magnesium is far less important that the 30 day moving average.

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In theory, there is enough magnesium in your bones (~12 g) to cover your RDA (~400 mg) for 30 days [1]. However, only a third of that is available without strongly negatively affecting your health. So if your Mg stores are full (if!), then you have about 10 days worth "stored". However, your day-to-day Mg homeostasis is done by your kidneys, i.e. on a much, much shorter time scale. So your daily intake does matter, but sporadic deficiencies can be compensated for about 10 days.

[1] Alawi et al. (2018) Magnesium and Human Health: Perspectives and Research Directions; https://pmc.ncbi.nlm.nih.gov/articles/PMC5926493/

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