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Fossilization (soft tissue)can certainly occur with a human life time, just look at some of the comments!

But returning to more worthwhile subjects, in following the article's references, #24, I came across this interesting link that describes different kinds of chemical reactions according to the organ being fossilized:

“SOFT-TISSUE PRESERVATION IN MIOCENE FROGS FROM LIBROS, SPAIN: INSIGHTS INTO THE GENESIS OF DECAY MICROENVIRONMENTS
MARIA E. MCNAMARA*,1, PATRICK J. ORR1, STUART L. KEARNS2, LUIS ALCALÁ3, PERE ANADÓN4 and ENRIQUE PEÑALVER MOLLÁ5
1 UCD School of Geological Sciences, University College Dublin, Belfield, Dublin 4, Ireland
2 Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol, BS8 1RJ, U.K.
3 Fundación Conjunto Paleontológico de Teruel-Dinópolis, Avda. Sagunto s/n, E-44002 Teruel, Aragón, Spain
4 Consejo Superior de Investigaciones Científicas, Institut de Ciències de la Terra “Jaume Almera,” Lluís Solé i Sabarís s/n E-08028, Barcelona, Spain
5 Museo Geominero, Instituto Geológico y Minero de España, C/ Ríos Rosas, 23, E-28003, Madrid, Spain maria.mcnamara1@ucd.ie
The Late Miocene Libros biota is a lacustrine-hosted, Konservat-Lagerstätte from Libros, near Teruel in northeast Spain. Adult frogs are characterized by the preservation of their soft tissues, some in histological detail. The soft tissues of the body outline are preserved as a layered structure, which comprises a central carbonaceous bacterial biofilm enveloped by the phosphatized remains of the mid-dermal Eberth-Katschenko layer, external to which is a second, thinner, carbonaceous bacterial biofilm. Bacterial autolithification is restricted to limited phosphatization of the cell margins of bacteria adjacent to phosphatized dermis. Phosphatization occurred during the late stages of decay; phosphate was sourced primarily from the dermis itself. Other tissues and organs are also defined in authigenic minerals: nervous tissue (aragonite), the stomach (calcium phosphate), and collagen fibers of the dermal stratum compactum (calcium sulphate); bone marrow is organically preserved. The disparate modes of soft-tissue preservation within individual specimens reflects development of several highly localized, chemically distinct microenvironments within the frog carcasses during decay. These microenvironments correspond to individual organs and tissues, were established at different times during decay, and varied in their duration. The preservation of soft tissues via multiple taphonomic pathways was controlled ultimately by anatomical and physiological factors.”

Note the second sentence, some preservation at the microscopic level. Decay and preservation appear to parts of the same process.