Returns the current run time for a process.
process-run-time process => time
A positive integer or
process-run-time returns the current run time for process in internal time units. If the value cannot be determined (currently this is only on FreeBSD), then the return value is
The value returned by
get-internal-run-time is similar, but on some operating systems it is the total time for all Lisp processes in the image.
LispWorks User Guide and Reference Manual - 20 Sep 2017