forever; if a number animation stops after that many seconds.
@end defun
+@vindex image-minimum-frame-delay
+@vindex image-default-frame-delay
@noindent Animation operates by means of a timer. Note that Emacs imposes a
minimum frame delay of 0.01 (@code{image-minimum-frame-delay}) seconds.
If the image itself does not specify a delay, Emacs uses