How long did Saphira stay in her egg from the day it was laid by her mother?

Question

How long did Saphira stay in her egg from the day it was laid by her mother?

Answer 1

A little bit over 100 years

Saphira was born shortly before the Fall of the Dragon Riders

Was Saphira's egg laid immediately before/during the Fall, or did it happen a significant amount of time before that?

Christopher Paolini: It was laid fairly close to the Fall.

_{Twitter, May 31 2022}

The Fall of the Dragon Riders ended one hundred years before Eragon found Saphira's egg.

So Saphira spent a bit over 100 years in the egg. Perhaps something like 105 years.