How long would it take for E. coli to outweigh the universe?

Escherichia coli reproduces every 20 minutes when nutrients are plentiful.

So, under ideal conditions, starting with a single organism, there would be 8 after 1 hour, 1 kg after 13 hours and after 76 hours, given sufficient food supply, the mass of bacteria would exceed the mass of the observable universe!

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