Hello,
It would be great, if we could set the maximum time spent on rendering a frame in Arnold. This option is already available in other renderers such as Iray (in Substance Painter) and Cycles (in Blender).
An example of a situation of when that feature would come in handy would be if I had only 24 hours to render 240 frames of animation as a draft; I would have to limit each frame for 6 minutes of render time.