timelong

noun

Plural: timelongs

A long while; the time interval concerned.

Examples:

—Do we know where that room is?
—Behind the painting.
—Could you show it to me?
—That's what I have been urgenting you for all timelong! I will show it to you, sure, gladly! Get in the motor! (Source: J∙ Okram - The Mystery of the Rammed Key.)