It varies with course and experience level. 

Students enrolled in After Effects Kickstart, Animation Bootcamp, or Character Animation Bootcamp typically spend about 15 to 20 hours a week on their coursework (i.e. assignments, podcasts, reading materials, lesson videos, etc.).

Design Bootcamp is a bit more rigorous and students will typically spend 20 to 30 hours a week on theirs.

Rigging Academy is entirely self-paced and students spend an estimated 3-5 hours per chapter on coursework.