Automatically determine Actual duration by Work Start & Work Finish

Dear PM Expert,

When we time confirm the Maintenance Order using T-code IW41, Is it possible to automatically determine Actual duration by subtracting Work Finish from Work Start?

(Eg: the same way which Breakdown dur. Calculates based on Malf.start & Malf.End )

Can the system propose Actual duration based on Work Finish/Start times

Please advice.

Thanks

Ashok M