I have just counted the senconds Nadal took to serve from the moment the previous point was finished in his first serving game in the fith set against Federer (Federer leading 1-0). Nadal didn;t take longer than 18 seconds in any of his serves, 7 seconds shorter of the maximum allowed 25 seconds.
I will check now the final game of the match.
The Slams aren't run by the ATP first of all, they are under the ITF. Do it for the whole match, if you are convinced that he doesn't take more than the alloted time.