Anime ended ep: 25 was last
In manga: chapter 33 was last
34-51 chapters are out
basically they used 33 chapters from the manga to create the anime
means if shingeki gets 66 chapters they would've enough material for a second season
4 anime episodes = 4 weeks
24 episodes = 24 weeks = 6 months = 6 manga chapters
means they could start the second season right now in 1 year
but i don't know if they will
