The generation time for bacteria is time which it takes for population to double. Generation time G can be found using experimental data and formula
G = t / (3.3logbF) where t is time period, b is number of bacteria at starting of experiment and F is number of bacteria at end of experiment.
Generation time for mycobacterium tuberculosis is 16 hrs. How long will it take for two of these bacteria to multiply to 256 bacteria.