Gcode generation time


Regarding a project I am working on I have a question. For at home I want to make a DC calander. With the file of sandyeggo. I have cleaned it up and want to carve it.

However the generation of the gcode and simulation are taking quite a long time. Last try took 2 hour and still no result. My question is do I need to be more patient or is something wrong?

Thank you for your feedback.