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Alternative wording: the ratios of these pairs (13 days / 247zs) and (247zs / t_P) are approximately the same.

t_P being the Planck time here.

Another alternate wording: 247 zs is the geometric mean of t_P and 13.1 days.

Planck time, 247 zeptoseconds, and 13.1days are equally far apart on log scale.

Planck time is really small.

Thanks, I can understand this one :P