Slow Rendering!!!

[fa2020]

Hi,
I've downloaded a pre-made elevator scene from address below:
https://3dsky.org/3dmodels/show/lift_car_model_elevator_interior
I downloaded the file and tried to convert all the materials into Corona material. I added a rectangle light behind the glass light at the ceiling and an another light with lower intensity below the glass light (affect reflection and specular turned off and just diffuse  remained  turned on for enhancing the lighting).
I set up a camera but render took too long and was noisy.
Can you please help me to get a better rendering in less time?
If possible please provide your scene files in a zip file, so I can study the right setting.
My system specification is:
CPU: Intel Corei7 4790K 4GHZ
RAM: 16GB DDR3
GPU: ASUS RADEON R9 3GB
Thanks.

[romullus]

Pictures? Screenshots? Render settings? I've lost my crystal ball.

[JViz]

If you could provide the file you're using maybe we could go through your materials lights and settings to figure out what went wrong.