How can you prove PR is not updated for 100 days?

[seo.gops]

Everyone says PR is not updated for 100 days. Any proof on that?

[MeghanIzzo]

The First 100 Days in A New Job – Make Them Count!

Preparation: Understand the Expectations.
Learning: Ask Questions.
Establishing Contacts: Build Relationships.
Demonstrate Your Capacity: Bringing In New Ideas.
Take Your Time: Avoid Taking On “Too Much Too Soon”.
Focus on The Goal: No Mistakes.