One can make a point that you cannot give even one example of a server serving at the 5th second, unless the receiver indicated that that he was ready. That is what "reasonable pace" means, and if you ever played tennis (or indeed were able to observe what is going on before your very eyes, instead of
staring at your magazines with the Nadal wearing only underwear while a tennis match was underway) ...... you would have noticed that short pauses are quite common between first and second serve, because the players don't want to lose their rhythm. Yes, that info is more easily accessible for people that play ... where was I ..... ah, yes, the above post is a complete and utter crap.