It took me about 2-4 hours . 15-30 minutes to render with 2000 samples (resolution of 3000x2250).
More renders on my Artstation: artstation.com/emanuelmino
Beautiful model and I especially like your studio-like lighting.
My only crit is the material for the interior looks a little too “hard” - for me it looks like rock rather than bumpy/fluffy soft material.
Amazing work though.