It really depends on the person. I find I'm not able to absorb more than 1-3 hours of new stuff each day. It's also a lot easier for me to commit 1-3 hours ev

It really depends on the person. I find I'm not able to absorb more than 1-3 hours of new stuff each day. It's also a lot easier for me to commit 1-3 hours every day. There's an idea that you need to learn a lot up front, and then you're a "programmer". Doing 1-3 hours of learning a day, gets you in the habit of ALWAYS learning. You never know enough, so it's not a 3-4 month process where you come out at the other end and you're done. I think 1-3 hours a day is manageable by everyone, and you don't ever run into diminishing returns for the day. That doesn't apply to actually programming. If you're building something, and you have the time, more hours in the day is generally better. If the focus is on learning, 1-3 hours is probably good for most people, and something that's easy to keep up with for years.