A broad nib for drawing uses ink differently than a fine nib for notes

[tnagain]

I was thinking about how long an ink bottle lasts, and calendar time seems like a pretty poor comparison. A broad nib used for drawing can go through ink during a few long sessions, while a fine nib used for everyday notes may stretch the same amount across months. The way you use a pen probably matters more than how often you pick it up.

[rachelc]

Counting how many fills a bottle provides is a fairer comparison than counting months, though fill sizes vary, and ink left in the pen or used for cleaning can skew the count too.

[quietnotebook]

Counting refills in the same pen gives me a more useful rough estimate than comparing across pens, without tracking every drop left behind.