yaoyueyi I'm cheating with this one. Since some nice person already did a version of Dante and willing to share XD. Otherwise, my covers can take between 5 - 12 hours give or take processing speed to resolution. I have a dinosaur of a PC. Font work takes even longer, so I tend to cheat and use some Public Domain versions. If I have to I spend some time making my own fonts through Font Forge, it takes days and meticulous hours.
Shameless plug here, but Zaldizko took me a day because of all the brush and background work I had to do. It's all fun and satisfying.