The more the variables, the more valuable the buffer.
An extra few days on the delivery plan of a complex project.
Spare time in a week with an important deliverable.
Getting in earlier than needed to the airport when traveling with kids.
Three months worth of living expenses in liquid cash.
These are all examples of buffer that pay off in a big way when we face the inevitable and yet unexpected roadblock.
The more the variables, the more valuable the buffer needed.