NaN after calculating Duration

The formula is indicated on the screenshot. How to get Duration value, not a NaN?

Screen Shot 2020-09-17 at 4.04.46 PM Screen Shot 2020-09-17 at 4.04.36 PM Screen Shot 2020-09-17 at 4.04.29 PM Screen Shot 2020-09-17 at 4.03.50 PM

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Math with dates can get a little tricky. Sometimes you need to use a function instead of a simple operator.

DATETIME_DIFF({Starttime}, {Requestdate}, 'seconds')

It is documented in the formula field reference.

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