A gigasecond (symbol: Gs) is one billion seconds. That is about 31.7 years. It can be written as 109 seconds.
3.16 Gs is about 1 century (100 years). 31.6 Gs is about 1 millennium (1000 years).
This page lists times of between 1 and 1000 gigaseconds, or between 31.7 and 31,700 years.
Shorter times
351 years – half-life of californium-249
years – time since the Taj Mahal was built
years – age of the King James Bible
418 years – half life of silver-108
432.2 years – half life of americium-241
years – time since Christopher Columbus reached the New World
years – time since the printing of the first Gutenberg Bible
680 years – half life of niobium-91
790 years – amount of time the Zhou Dynasty lasted, the longest dynasty in Chinese history 898 years – half life of californium-251 969 years – alleged age of Methuselah at death 1000 years – one millennium = 3.16 x 1010 seconds years – time since the volcanic destruction of Pompeii years – time since the birth of Jesus Christ, according to Dionysius Exiguus years – time since the assassination of Julius Caesar years – time since the death of Alexander the Great years – time since the death of Socrates years – age of the Parthenon years – time since Rome was founded, according to legend 3,200 years—time since the Greek Dark Ages and the beginning of the Iron Age 3,800 years—time since alphabetic writing started 4,200 years—time since the completion of Stonehenge. 4,569 years—time since the building of the Great Pyramid at Giza. 4,851 years—age of oldest living plant, a bristle-cone pine named Methuselah 5,715 years -- half-life of Carbon-14 6,500 years—time since the invention of the wheel 7,370 years—half life of americium-243 8,500 years—half life of curium-245 11,000 years—time since city of Jericho was founded 12,000 years—time since end of Pleistocene Epoch 12,000 years—time since beginning of Holocene Epoch 12,000 years—time since beginning of Neolithic Age 20,300 years -- half life of niobium-94 21,000 years—time since the Last Glacial Maximum 24,110 years -- half life of plutonium-239 29,000 years—time since the extinction of Homo neanderthalensis. Longer times