Type II = CrO2 = high bias
They are the only tapes suitable for cassette multitracking.
Don't use Type I or Metal. Multitrackers are designed for Type II.
Musician's Fiend has 30-minute Sony cassettes that are supposed to be good for multitracking. That's 15 minutes in one direction, or 7:30 at 2x speed if you have it. I would use those for multitrack masters, one cassette per song.
For more of a 4-track idea notepad or live recordings, you can go up to a 90 (45) minute cassette (normal speed), but don't go to 110. 110s are too thin and break too easily.
Added: OMG, I just noticed I'm replying to a 7-year-old topic.