Variable: kill-ring-max
kill-ring-max is a customizable variable defined in simple.el.gz.
Value
60
Documentation
Maximum length of kill ring before oldest elements are thrown away.
Source Code
;; Defined in /usr/src/emacs/lisp/simple.el.gz
(defcustom kill-ring-max 60
"Maximum length of kill ring before oldest elements are thrown away."
:type 'integer
:group 'killing)