It's bearable to play, yeah. Best Tri-Ace game in a long... long while. 1000? Depends if you're in it for the long haul
It will go like this
Normal -> About 30 hours at most, just play through the story
Hard -> Cleanup, Compulsive will require lots of farming, expect 80 hours minimum
Infinity -> Pick your team, use only them, create the strongest armor/weaps from the start, and go directly through the story. Minimal farming required to make HP increase books for the Queen, otherwise easily done, since it's the final achievement