What is the rule, unspoken or otherwise, on how late is too late to make an out call on clay? I've played the same guy recently that will hit his return of my serve, and if it's close to the line, sometimes he stares down looking for it and calls it out after I've already hit my second shot or at least very close to it. I'm not even disputing in or out, as it is my practice not to dispute my opponents calls, I'm only asking about the time gap. To give you some perspective, we are both good 4.5 players, so the serve and returns and not patty cakes.