Variable: calc-display-working-message
calc-display-working-message is a variable defined in calc.el.gz.
Value
lots
Documentation
If non-nil, display "Working..." for potentially slow Calculator commands.
Source Code
;; Defined in /usr/src/emacs/lisp/calc/calc.el.gz
(defcalcmodevar calc-display-working-message 'lots
"If non-nil, display \"Working...\" for potentially slow Calculator commands.")