# How long is too long since my last period 16 years old?

If you have regular periods then 5-6 weeks is too long since your last period. If you are 16 years old, you may be experiencing irregular periods. It happens.

### The Great Renaissance period took place at the end of the Middle Ages How long did this period last?

### How long did the Precambrain last?

Precambrian is an informal term for the time before the Cambrian Period, the first period of the Phanerozoic Eon. The Precambrian consists of three eons, the Hadean, the Archean, and the Proterozoic. The Hadean Eon is about 760,000,000 years long. The Archean Eon is about 1,300,000,000 years long. The Proterozoic Eon is about 1,960,000,000 years long This comes to a total of 4,025,000,000 years.