<prompt> Generation time for leprosy bacillus is?8-10 days10-12 days12-15 days15-20 days  <response>: The generation time of the lepra bacillus has been found to be exceptionally long ,12-13 days on the average but may vary from 8-42 days. Reference:Textbook of Microbiology, Ananthanarayan Paniker ,9th edition,page no:364. p 