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Not to much :) different timing depending on particular illustration. 1-2 hours per one. 8 hours max for one of illustrations here.

That's amazing! It shows that you optimized your workflow. I'm preparing an illustration for the latest @sndbox contest, but it'll take many many hours. ^^'

Yeah, this is my bread for last 10 years so I have to find a way to work faster.

I totally understand. I've been in the design field for over 10 years, but worked professionally the last 5-6. I still need to learn how to draw faster tho'.