15.57.1  FOR 

If  FOR n is specified then TOPDRAWER will wait for n seconds, then resume
normal execution.  n may be in the range 0 to 200.
(Default:10)

example
     TD:REPEAT "NEW;SET HIST NEXT;HIST;WAIT FOR 10" 10
Gets  the  next  histogram,  plots  it,  then  waits for 10 seconds before
plotting the next one.