I got this from the offical JLPT website and I got rid of the exact amounts while keeping the estimated amounts:
Test content summary
Level Kanji Vocabulary Listening Hours of Study Pass Mark
4 ~100 ~800 Beginner 150 60%
3 ~300 ~1,500 Basic 300 60%
2 ~1000 ~6,000 Intermediate 600 60%
1 ~2000 ~10,000 Advanced 900 70%
1) Is that 600 hours + 300 hours 3 150 hours or is it just 600 hours total?
2) 600 hours shouldn't take 3 years, in 2 years with 1 1/2 hours of study a day you could pass the test. (I'm guessing it's active study not just passive)
There aren't very helpful for choosing which level to take...
If I did 4+3JLPT in a year I would assume 2 in a year would be the same.
What are your opinions on the matter?
Test content summary
Level Kanji Vocabulary Listening Hours of Study Pass Mark
4 ~100 ~800 Beginner 150 60%
3 ~300 ~1,500 Basic 300 60%
2 ~1000 ~6,000 Intermediate 600 60%
1 ~2000 ~10,000 Advanced 900 70%
1) Is that 600 hours + 300 hours 3 150 hours or is it just 600 hours total?
2) 600 hours shouldn't take 3 years, in 2 years with 1 1/2 hours of study a day you could pass the test. (I'm guessing it's active study not just passive)
There aren't very helpful for choosing which level to take...
If I did 4+3JLPT in a year I would assume 2 in a year would be the same.
What are your opinions on the matter?

. Just because a lot of Chinese learners use 2000+ hours of classroom study to get there, doesn't mean that's the minimum requirement. What say others?
.