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now: Sat Apr 10 23:15:57 2021 ... mod: Sun Apr 4 18:50:31 2021

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doubling time = T ⋅ ln(2) / ln(N_{L} / N_{i}) measured in units of T.
example:
at 4:00 pm on Monday, 3 x 10^{5} cells are plated. At 3:00 pm the following Friday, 2.5 x 10^{6} cells are counted.