Need help on decreasing rending time for a certain product

subtl3

Hello, 

I purchased the Executive Restroom. SKU58239

Tried to render it with iray but it is taking painfully long...a lot longer than my other irays product.

Any suggestions on how to make render time faster? I turned off shadow, ray trace, reflections

Still taking too long. Please help.

Sevrin

What do you have in the scene apart from the set?  How is it lit?   A screenshot of work in progress would help.

Paintbox

Does the render drop to CPU ?