With just a couple of hours of imaging last night I split my time over a couple of targets, Orion being one of them. Quite happy with hour an hour came up, ended up a little on the shorter side as I didn't want to blow out the core. 6x200s RGB, looking back over the data now I probably could have pushed it to 400s without causing saturation for anything other than the trapezium stars, something to do when I have more than an hour up my sleeve.
Still trying to figure out how to run the HDR without destroying the brighter stars (see the rings int the middle of the stars). I attempted to make a bright star mask but it seemed to do more harm than good, probably just a poor mask!
Higher Res on Astrobin.