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Pretty print of time taken since last started.at.
timetaken(started.at)
The result of proc.time() taken some time earlier.
A character vector of the form HH:MM:SS, or SS.MMMsec if under 60 seconds.
# NOT RUN { started.at=proc.time() Sys.sleep(1) cat("Finished in",timetaken(started.at),"\n") # }
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