I'm sure you can't charge from the wall in a matter of seconds... pulling 1000W out of the wall should be about 20A so you'd blow a fuse if you charged any faster. If it's 100% efficient and then your laptop uses 100W, you'd get 10 times the battery life as the time you spent with the thing plugged in. So the practical limit is, you could charge 2 hrs of battery in a minimum of 12 minutes.

But it sounds like great news nonetheless

edit-- See my third post in this thread (post#12), I think it's 6 minutes instead of 12.