Probably, Front...But I just picked an arbitrary number to allow a little extra time for "long, grueling" rallies while still keeping it uniform. My simplistic view is that the rule is the rule and it should be enforced as such, regardless of the circumstances. Kinda like referees in the NFL and NBA who "let the players decide the game" in the final seconds, but not during the rest of the game. A foul is a foul and interference is interference, regardless of when it happens. Same with tennis for me. Just my opinion.