Yeah, there are a few that seem to have a little pause between the click and the start of the sequence, allowing multiple toons to turn in before the NPC goes wandering off. There are a few others that will only run the sequence once every couple minutes or so, so you only need to watch it once. Almost all of them, in my experience, only allow one turn-in at a time. I have a macro for almost everything and it hardly ever works to get in all five turn-ins before the script starts.