Hi Ipiotis​ ,
Twinmotion is very heavily dependent on the GPU and does not rely very much on the CPU for rendering. RAM utilization will vary depending on how complex the scene is. Render times will also vary depending on your particular hardware, so I can't say for certain whether 5 hours to render a Path Traced video is normal or not without knowing your computer's specs.
Some settings that may cause render times to increase are if you have Max lighting or Refinement enabled under the Video Export settings and disabling these should help. Exporting 3D or 360 videos will also significantly increase renders times compared to standard videos.
Best,
Raghib