Why does Long Now not recommend more than one leading zero. The universe is ~13.7 billion years old and is expected to last more than 100,000 years. Heck, Homo

Why does Long Now not recommend more than one leading zero. The universe is ~13.7 billion years old and is expected to last more than 100,000 years. Heck, Homo sapiens have been around for more than 100,000 years.