thank you both!

(add-hook 'org-finalize-agenda-hook
          (lambda ()
            (set (make-local-variable 'tooltip-delay) 86400)
            ;; disable the face that comes up when mouse pointer
            ;; is over an org agenda line.  that can be confusing
            ;; because i already have a highlight face for point.
            (remove-text-properties
             (point-min) (point-max) '(mouse-face t))))

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