Project 2B - Rendering issues - part 2

After emailing my tutor, he gave me some tips on how to lower render time which managed to lower it down to 12 minutes a frame, still too high to complete on time so I went in to chuck it on the x grid but that failed so I will not be able to render all my scenes in time. Another issue I am having is the physical sun and sky doesn't not show up in the background only its light shows up.