Glad you like ^^ I haven't heard of https://steempixels.com/ before :O Got to take a closer look. Do you know any posts explaining it?

As for Ghibli one, it was almost 2 years ago, but I'm guessing it took me around 8 hours then. I wouldn't be surprised if even more than that. :)

When you don't have enough experience, you just put extra time into your work to make it look more professional :D