Are you almost done with your map? If so, I'd say: suck it up, fire off your compile.bat right about bedtime, and let that puppy run overnight.
I would offer to help you out by doing a "-threads 4" compile for you, but you wouldn't really save any time, what with having to waste time emailing files back and forth.
Have you expirimented with the "-cheap" flag? It, apparently, "stops Q3Map from calculating light on a sample after it exceeds (255, 255, 255)." Perhaps that might speed things up for you?
Sorry, don't really have any more to offer... :^\