I mean it's totally up to you if you want to do it, but that seems like an extremely short amount of time to do each lesson. Most of the critique I get from u/uncomfortable comes from the angle that I can rush through things sometimes, leading to me having to go back and do exercises again until I fully understand the scope of the lesson. Aside from that, you also have to keep in consideration that you should be operating on the 50% DrawABox, 50% Free drawing. Just doing the math on that, if you draw for 8 hours a day; 4 hours DrawABox and 4 hours free-drawing, that would be 120 hours for DrawABox in a month. There are a total of 82 pages with varying exercises, all of which have varying levels of difficulty and shouldn't be rushed. But if we are to horribly average them out, that would be about 1.5 hours for each page of homework. While that number is more than acceptable for earlier ones, it may be more difficult to achieve that later on in lessons. We haven't even factored such challenges like the 250 box, cylinder, or chest challenge in, all of which beckon a ridiculous amount of time to complete. Also you should probably do the reading and watch the videos.

All of this is technically achievable, but you would have to push yourself to do that amount per day consistently for 30 days. I don't know how feasible it is, as I'm only on lesson 2 but ultimately, it's up to you to decide what you're capable of.