The factor 4 is also not too important -- with the doubling time of 3 days, it's a difference of only 6 days in one or another direction -- any delays or speedu

The factor 4 is also not too important -- with the doubling time of 3 days, it's a difference of only 6 days in one or another direction -- any delays or speedups can easily add up to that. Only the speed of growth is stable and completely consistent information across many countries and what everybody has to worry to reduce.