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No, man/ I was wrong, sorry. It is normal regular way, they just look like singular, but they are actually are in plural accusative case. For example:

тарелка (sing) - тарелки (plur)

одна...

Days are plural: два дня - two days.

I never noticed before, but we do use "days" in sinlular form when we taik about two, tree and for days: два дня, три дня, четыре дня, but пять дней, шесть...