That’s an amount of gear and people comparable to what a mid-sized European country could have and what a big European country could muster on short notice. It’s “only” a factor of 2 or 3 less than what Russia prepared for Ukraine at the beginning. It’s likely more than the combined forces of the Baltic states’ militaries and the NATO contingents stationed there.
With a generous dose of optimism it is a force that would at least hold a conventional invasion at bay, if not defeat it via superior tech and sea support. It is a lot even in absolute terms, for an exercise it’s massive.
Of course they do someone cleans their houses, someone drives their limousines, someone brings cookies to meetings with lawyers.
Some research shows that the newer variants can hang in the air for up to 12 hours.