Apocalypse pisses me off because the supernova warning gives you so much more time than you actually have. It starts at a minute, and when you play the FS2 campaign for the first time, it won't dawn on you to race for the Vega node for some time, and Command doesn't tell you to get the heck out until the timer says 50 sec or so. The supernova hits when the timer still has about 10 sec left, and since you will die if your warpout animation hasn't finished 100% when the shockwave animation triggers, that means hitting alt-J with less than ~17 sec left on the timer will result in death. Happened to me multiple times, so when I play that mission now I make sure I'm within about 2500 m of the node near the 12 minute mark, just to be safe.