All good things have been mentioned already. To add to that, I keep saying: “Never compare yourself to others, only to yourself from yesterday.”
Now with that in mind you have a good way to gauge your personal progress here, even more so since you didn’t have to come up with the idea, but worked off a reference. Since you timed yourself with this building, make notes of that. Move on to other projects, keep learning and progressing. After a while, maybe a month or so, of more learning, do the exact same project again, no iterations, just a carbon copy and time yourself again. I’m gonna bet you will be faster and notice more efficiency in your workflow. That is of course if you have targeted your learning.
If you still run into the same issues as before, you’ll know that you have to refocus your learning. Either way it will give you either confidence or direction. Or both. 🙂
The important thing is not how long it took you, but if you had to do it again, would you still have the same struggles or are you improving from the first go-around.