Given the assumption you use two custom fields (or are willing to do so) you can do maths on those two fields using Apps from Marketplace.
In an earlier requirement we calculated, for example, a Duration (how long is the issue in a specific status of the workflow) by a simple calculation on two fields.
In a different requirement there was the need to calculate the duration multiplied by customers affected by the issue - there are several Apps enabling you to do mathematics on two fields or even more.
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