* Pencil Hardness: The harder the lead (like a #2), the longer it will last. Softer leads (#9 or higher) write darker but wear down faster.
* Writing Pressure: How hard you press on the paper greatly affects the speed at which the lead wears down.
* Length of Words: Obviously, a page full of "I"s will use less lead than a page full of "antidisestablishmentarianism."
* Paper Quality: Smooth paper will use less lead than textured paper.
* Other Factors: Sharpening techniques, the length of the pencil, and even the humidity can all influence how long the lead lasts.
Instead of a specific number, think about it this way:
* A single pencil can write hundreds, even thousands of words if used carefully.
* Some pencils may only write a few dozen words if they're soft, used with a lot of pressure, or on rough paper.
It's really up to the writer and their style!