(defun timings (function)
  (let ((real-base (get-internal-real-time))
        (run-base (get-internal-run-time)))
    (funcall function)
    (values (/ (- (get-internal-real-time) real-base) internal-time-units-per-second)
            (/ (- (get-internal-run-time) run-base) internal-time-units-per-second))))

CL-USER> (timings (lambda () (reduce #'+ (make-list 100000 :initial-element 1))))
17/500
7/250