Actually, no , it depends on how you build it, it coul've been 30 blocks away. We'll have to wait for reggie on that one.
Also, if he was using the method where you place the block afterwards, it would've just disappeared and he'd just be confused while the server dupicates it without him knowing. (see: http://www.youtube.com/watch?v=ybXpQoChQoY&feature=related)
Also, if he was using the method where you place the block afterwards, it would've just disappeared and he'd just be confused while the server dupicates it without him knowing. (see: http://www.youtube.com/watch?v=ybXpQoChQoY&feature=related)