Ive done the math on Gundam's Kills Achievements:
20 hours i've killed 27k or so gundams. First Achievement is 50,000. So at probably 30-40 hours of normal unfocused play ill hit 50,000. There's still the 100,000 Achievement. Now I like this game, but jesus.
Granted I can go ahead and take maxed out Heero and Wing Zero to the most populated fight and grind, but thats pretty guh. Plus I cant figure out how new skills are gained once you max pilot level.