Hahaaaaaa
Completed it. Seeing as I split my time between this, Zelda, VC and the DS, it hasn't been something I've played continually.
I'd say total time for all levels on "Ace" amounted to about 11hrs.
I was actually quite surprised at how short the game is.......oh well.
On top of this, redoing missions on any other level now seems easy (too easy)...and the unlocked Russian aircraft like the Berkut also make everything appear a lot easier.
Additional flight time redoing missions with different aircraft ~3hrs so far.
I think I've pretty much plumbed the depths of this game and want to get Mario Strikers Charged Football now
....so it's off to trade-in it goes
Overall I'm VERY glad I bought it and still recommend it highly.....5***** and definitely worth buying for those who haven't done so yet.