'It is not well understood, which molecular and biochemical pathways are utilized by such cryptobiotic organisms, and how long they might suspend life. Here, we show that a soil nematode Panagrolaimus kolymaensis, suspended life for 46,000 years in the Siberian permafrost.'

https://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1010798