Double, that's something I've been stressing to Ed. He hasn't done a single workout this year that was intended to leave him crawling back into the house and I remind him of that every week. My usual line: "you should feel like you could do at least one more repeat after you have finished this workout" or something similar.
Ed may get to do a couple gut buster workouts in late August or early September, we'll see how things play out, but until then there will be constant reminders to throttle those workouts appropriately. As I'm constantly reminding him, he wants to peak for Al's Run, not a little 5 miler in July or a workout in early August. Those gut buster workouts will, depending on where you are, either bring you to a quick peak or push you over the edge. When 2 or more months out from your goal race, neither is a good thing.