Click 'Read More' to the bottom right to read this article:
After 7 days, they found that the dry heat treated leg did not mummify as expected, so that experiment was halted. But the natron experiment continued, with natron removing water from the soft tissue and stopping microbial decay. This allowed the leg to fully mummify after 208 days. These remains showed a greater degree of fine soft tissue preservation than those seen in ancient mummies. The experimental mummification also took much longer than the ancient Egyptian records indicate; the experiment ran for 208 days but ancient Egyptian mummification apparently only took around 60 days.
Lewis, T. 2015. Modern Human Leg Mummified Using Ancient Egyptian Methods. LiveScience .com, accessed 27 May 2015.
Papageorgopoulou, C., Shved, N., Wanek, J., Rühlil, F. J., 2015. Modeling Ancient Egyptian Mummification on Fresh Human Tissue: Macroscopic and Histological Aspects. The Anatomical Record, 298(6): 974–987.