12 hours is quite a bit of overkill to mobilize paratroopers. Historical ones would have been up and off to their objectives the moment they got untangled on the ground. It shouldn't take that long to mobilize them and they suck if your trying to drop them behind enemy lines and take a bunch of provinces to make your enemy panic.
“No man is happy without a delusion of some kind. Delusions are as necessary to our happiness as realities.” -Christian Nestell Bovee