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.
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.
burning_hamster|11 months ago
[1] Alawi et al. (2018) Magnesium and Human Health: Perspectives and Research Directions; https://pmc.ncbi.nlm.nih.gov/articles/PMC5926493/