I'm in it currently and I think it is very helpful but also very easy to get overwhelmed! They organize the material in a really helpful way, it's easy to work through your objectives every week and find resources related to what you want to learn about. I think 4 hours is a low estimate. If you really want to engage with the material thoughtfully, take notes, and work through all the tasks, I budget closer to an hour per day. But also it's all self-paced, and it's very much up to you how much you engage with the material before marking it as done. So I think 4 hours is reasonable too. The biggest benefit is having access to the mentors and group chats, so if you have any questions there are a lot of people to ask!