Lightmass calculations are super intensive. Each time I build lightings it takes 15 hours in my PC (AMD A8-6600K 3.9GHz 8GB RAM), and the PC freezes useless during that time.
So I was wondering if is there any company, Epic or any others, offering cloud computing off-the-shelf for lightmass calculations, a kind of Amazon AWS that offer everything for externalizing the lightmass calculation to a server?
I think Unity has started to offer something similar with Unity 5.