Hi. I cant really say how long it will take without seeing the actual drawing, which in turn i will have to show to my 3d artist to see how long it will take to design it as 3d model + creation of scene.
Rendering itself for 1 image will not take that long.
You can see some 3d renders - sample in my porfolio, its not all i done, but you will get the idea.
If you have any questions, please do not hesitate to ask me.
Thank you and hope to work with you in near future.
Best regards,
Ruslan