So, I'd like to know if, purchasing this tool, can I use it to audio for fictional characters to interactive books, videos, games, and apps? My main goal is gaming and education.

Which usage limitation about non-personal projects? I mean, I'm a teacher and sometimes I create games with my students. Can I use these graphics in free and commercial projects developed with another person (2 or 3-people teams)?

If used to create gaming character voices, how many files/minutes in audio can I generate for a month?