I'm curious as to if it's 150 hours of material that needs to be recorded or 150 of work available.
I've been a VO professional for over 10 years, doing everything from commercials to audiobooks to video games to cartoons to everything in between, and will deliver quickly in the desired file format with fast communication.
I speak very clearly with good diction and attention to pronunciation. So, I would be a very good fit to voice texts on science and math. I even teach English to people in China every morning, teaching them all manner of subjects in English, including many kinds of math and science.
My demos are available on my profile.
Equipment and software include:
Shure KSM44 microphone
Focusrite Scarlet Solo preamp
Cakewalk SONAR X2
Adobe Audition CC