 Given the length of an era in logarithmic time (i.e., with given ratio "t"0/"t"1) the number of oscillations for Type VIII will be, generally speaking, less than for Type IX.For the period of oscillations one gets now Δ ln "t" = πξ/2; contrary to Type IX, the period is not constant throughout the long era, and slowly decreases along with ξ.As shown above, long eras violate the "regular" course of evolution; this fact makes it difficult to study the evolution of time intervals, encompassing several eras.