Even with invisible in ray tracing and with light emitter off, and a lower res (1000 pixels wide) light map, I'm still seeing ungodly high render times compared with usual.

Here's a clip from it, since its still rendering an hour and a half later, 1171x960 (same as preview size)

It just finished as I typed this, and I started it before a shopping trip I've just come back home from.

 I just takes far too long to be useful here.

Way too many people take way too many things way too seriously.