Twenty n is a new one on me, it was always n thousand in my hide and seek days, but it seems there are so many variations - n hundred, one thousand and n, n Mis

Twenty n is a new one on me, it was always n thousand in my hide and seek days, but it seems there are so many variations - n hundred, one thousand and n, n Mississippi etc. - with such a wide range in length of modifier, each spoken with its corresponding degree of rapidity, that I wonder if it's more a case of tapping into an instinctive feel for the length of a second, with the modifier word just helping focus the mind on the matter.