Wanted to count how much time i spending with making arts like this.
So, here it is:

Sketching - 6h 30min
Making neat lines and little lighting - 10h 40min
Flat color - 5h 45min
Making shadows - 10h 5min
Making background - 15h 30min
Little fixes, color correction, contrast, brightness - 1h 10min

Total time of work - 49h 40min + about 2 hours for searching textures, references, e.t.c