The number of lights affects the render times. If you turned your cockpit into a light then each polygon in the surface is a light source, which adds time. A more efficient approach is to turn the cockpit into a glass plane, set it to archi and place a light source, a meshlight, underneath. 

Cheers.

Paolo

https://www.preta3d.com
FB: https://www.facebook.com/RealityPlugIn
Tw: @preta3d
G+: https://plus.google.com/106625816153304163119
The Reality Gallery: https://reality-plug-in.deviantart.com