How much should I charge?

I'm about to start a side gig cataloging someone's home academic library in a spreadsheet. The job involves careful reading, accurate data entry, and working knowledge of basic publishing terms and title styles in French, German, and Italian as well as English. I also have to describe the condition of each book, with any flaws or damage detailed.

How much should I charge per hour for this work? FWIW, I have a master's degree in a field adjacent to the library's focus. This job is in the Chicago metropolitan area.

Thanks!

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