Total Time Including Incomplete Records

Show total time including incomplete record before a recorded Punch Out occurs.
Having this would display total time including the current record (which is not Punched Out) to track/watch if a time limit is imposed.
I have 2 clients that limit on-site time; having this would display total current time including an incomplete record, instantly. Otherwise one would Punch Out & then Punch In or use of a calculator.
This may have been asked using different description (apologies if so);
Thank you.