To answer the title of your thread: absolutely yes.
If you plan to go slow, you can still get through levels in a reasonable time with 15-20 lessons a day. If that’s still too much, you might want to consider purchasing a lifetime subscription (if you think you’ll take more than 2 years to get through the material). However, no subscription is necessary until you finish all of level 3’s content.
There’s even a team: Taking It Slow
I’m on it!
You came here to learn, so the important thing is learning. What speed is best for you is the speed you should go. I’m on the Slow team, and am doing very few lessons right now. So it’s all good!