Английский словарь американских идиом - dog's age

or coon's age {n.}, {informal} A very long time. Usually used after "for" or "in" with a negative. * /Charlie Brown! I haven't seen you for a coon's age./ * /Father hasn't had a night out with the boys in a dog's age./ * /I waited for him for a dog's age, but he didn't come./ Syn.: MONTH OF SUNDAYS.