I hit 23 hours on Infinite Space last night. About two hours of that was pure level grinding, though it was more for money than level, since level really doesn't seem to carry much impact into the space battles. Levelling up adds various special attacks, but they take a lot of action point (AC) build-up before they can be used. It's worth noting that the enemy usually just dodges them *sigh*. I'm enjoying the attainment of new ships, crew members and customisation modules, and I have to admit - the story's not half-bad.