1 E10 s

• Shorter times
• 680 years - The half life of niobium-91
• 1000 years -- one millennium = 3.16 x 10¹⁰ seconds
• Longer times

In this and shorter time intervals the "time since" entries should be replaced by reference to the articles for each century, decade, and year; e.g. 17th century, 1670s, 1671.