When doing GI renders it's best if you reduce your light setting to less than 100 ,try 50, 60. Spotlight are the fasters to render. Also if you have glass stuff it it very important that you have a proper glass texture or the objects will have this white hot spots that glow. The sum of the Transp, Color and reflection should be equal to 100 if it is over 100 it will have really HOT white spots. In the render room use photons 100,000 and 40%. Let me know if this helps you. Ringo