lispdoc - results for internal-time-units-per-second

internal-time-units-per-second
Variable: The number of internal time units that fit into a second. See GET-INTERNAL-REAL-TIME and GET-INTERNAL-RUN-TIME.
Example:
(defun time-string (time)
  "Return a string representing this internal time in min:secs."
  (multiple-value-bind (min sec)
      (floor
       (round time
              internal-time-units-per-second)
       60)
    (format nil "~2d:~2,'0d" min sec)))
Mentioned in:
CLtL2 - 25.4.1. Time Functions
HyperSpec - Constant Variable INTERNAL-TIME-UNITS-PER-SECOND
PCL - make it work make it right make it fast