hamster 48: guinea pig 17: mouse 5.8 hours
||Gibson B, Wilson DJ, Feil E, Eyre-Walker A. The distribution of bacterial doubling times in the wild. Proc Biol Sci. 2018 Jun 13 285(1880). pii: 20180789. doi: 10.1098/rspb.2018.0789 p.1 3rd paragraphPubMed ID29899074
|| Gibbons RJ, Kapsimalis B. Estimates of the overall rate of growth of the intestinal microflora of hamsters, guinea pigs, and mice. J Bacteriol. 1967 Jan93(1):510-2PubMed ID6020422
||P.1 3rd paragraph: "Estimating the generation time is difficult for most bacteria in their natural environment and very few estimates are available. The DT [doubling time] for intestinal bacteria has been estimated in several mammals by assaying the quantity of bacteria in the gut and faeces. Assuming no cell death Gibbons & Kapsimalis [primary source] estimate the DT for all bacteria in the gut to be 48, 17 and 5.8 h in hamster, guinea pig and mouse, respectively."