I disagree with viva. Siking out an opponent is just being a jerk. yes,
you could make the fight take over 16 minutes, but if someone did that
to me, I'd probably come straight to the boards (or at least message
my guild) and say "Don't fight this guy. he's a jerk." Or I might use
more colorful language, depending on the situation. I don't support
lowering the time limit though, because some people have slow
connections, and getting a few jerks who may or may not exist isn't
worth making the game innaccessible to them.
Waiting out a fight like Orlolro does is especially annoying during tournaments. If like me you can sometimes only be on for an hour of a tournament and you want to leave yourself in a strong position to be in the top 50% for a credit. Then you try to fit in as many games as possible. It's happened to me a few times when I have been just top 50% but also once when I was pushing for a top 3 finish with fifteen minutes to go(pre new tourney rules). I ended up shouting at my monitor and cursing my opponent (literaly with Bones and the blood of a young dear!). Razorborne makes a good point about slower connections. I say leave the time limit as it is.