Do you find that the times estimated to complete the challenges are very conservative? I started learning from scratch and I’ve completed the “Basic Algorithm scripting” in one afternoon. It is estimated at 50hrs…
You’ll probably finish some of the sections faster than the stated time, and other slower than the stated time. Personally I rushed through all the algorithms but I spent a lot longer on the projects - especially the dynamic backend projects.
Yeah, I found them conservative, but I had some prior programming experience (albeit in other languages.)
But ultimately it doesn’t matter how long it takes. It matters how well you learn.