Subtract time worked with text in excel

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I have a monthly timesheet with start, end, break time and holiday. I need to see how many hours per week , but Holiday is an text (OFF) and not sure how to correct the formula.

Example: Start - Finish - Break = Hours worked 8:30 12:00 0:30 3h /I have used =(finish-start-break)*24
Off Off Off #VALUE!

How it's the simple way to correct this error #VALUE! ? Thank you in advance.

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