What does the number displayed for "Project First Duration" represent?

[TegwynSt]

I am following Example of Velocity Reporting, August 14, 2019  - so, a lot of calculation - planned vs actual vs baseline (first duration) - but it doesn't display number of days or hours - calculations are working but I can't explain what is being pulled in reality 

Work-to-Commit Ratio Format:Number Calculation: ROUND(DIV(Actual Duration,First Duration),1)

see screen shot(s) - first duration column is just allowing a number of percentage

[Kurt_Jones · Accepted solution]

Tegwyn, it looks like that First Duration is a custom field.  You would need to look under custom reports->fields to see what information it might be pulling.