I’d suggest you think about the lesson videos in a module as just that: lessons. As in: I used to have an hour-long lesson once a week with my guitar teacher. In between lessons, it was up to me to practice the material from the lesson in order to solidify my understanding of it. Unlike my in-person lessons long ago, here it’s really easy to go back and view a lesson again if you need to. Meanwhile, Justin’s practice routine videos at the end of each module and the tools the website provides to organize and track your practice should help a lot. And remember the goal of practice is to build and solidify skills, so consistent smaller amounts of practice are more beneficial than infrequent large amounts.
EDIT: I’d no sooner posted this than I spotted a thread on using the website’s Practice Assistant.
@tony has provided good advice and there are discussions / resources on goal setting here in the forum. For many people a good initial goal is something like “learn to play n songs” where n is somewhere on the order of 5. That’s a clear, simple goal that you can measure progress against.
I wouldn’t worry too much about theory at the stage you describe yourself but I commend you for including it in your thinking. IMO the primary reason to learn theory is its value as a common language of communication among musicians. But you don’t need a lot: the notion of a major scale, how you build chords from triads in that scale, and the notion of numbers for chords (sometimes call the Nashville number system) is plenty to start and can take you a very long way.
Finally, the mantra of guitar instructors everywhere: learn songs, learn songs, learn songs.