No, you don't have to.  After every line of commands (which could be several commands strung together by semicolons) Chimera will wait one frame if the commands did anything that would change the display (and if there's no explicit wait command at the end of the line).  So the only explicit wait commands you needed in your script were the ones that waited 25 frames.  And it would have been better if it had been on the end of the preceding line (i.e. "reset p17 15; wait 25") or else you in fact get 26 frames since one frame will implicitly be shown after the "reset p17 15".

--Eric