WFab is right - I'll add that you can estimate the build time to see how things change as you increase and decrease the resolution. If you go to Project Settings, you can hit "Estimate Time to Build". Hope that helps!
Like the description says, for some reason the startup.tmd builds abnormally long, the erosion node to be specific. At 2049x2049 the build took 3m33s, and just to check i went and built the Grand Canyon example at its default 1022x2049 and it took 1m8s. Is their something i need to check or configure?