The volume of the LE is about the same as for the core 19m, the difference is the valve. Whereas the core has the speed valve the Notus still has 'standard' valve for inflation. My guestimate would be that you can add 15-20% of the time it would take you to inflate the core due to the higher resistance.
It is easy to self lauch by hooking the chicken loop onto your car, dog screw or whatever. I did this. Self landing as usual(for me) takes some technique like with every kite, i would say compared to other kites this is not much different, in fact it gives you some more time by being slower than a smaller kite.
P.S. Left one thing out in the review: I gave my skimboard to a guy with a 12m Switchblade at the beginning of the session. He never made it to the planing, never even got up on the board. Thought i should mention this. It looked like he had trouble keeping his kite in the air. Not a pro, but still
Hope that helps