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1 h = 60 min = 60 · 60 = 3600 sek
1 dzień = 24 h = 24 · 60 = 1440 min = 1440 · 60 = 86 400 sek
1 miesiąc = 29 dni, 28 dni, 30 dni, 31 dni = (obliczam 30 dni) 30 · 24 = 720 = 720 h · 60 = 43 200 min = 43 200 · 60 = 2 592 000 sek