The turnaround time varies from project to project. It will depend on the size, complexity of the models & number of views needed. Another major consideration is our availability. The more “realistic” the render is expected, the more time it would take. Interior rendering scenes take longer to model and render than exterior scenes. It has more assets, has lots of textures, lots of light sources, and lots of light bouncing which takes more calculation and time to render.
TL: DR = Interior Rendering Time > Exterior Rendering Time
For your reference, 3d modeling and rendering typically take 3-5 days per 1-2 images.