20, 25 and 30 minutes:
Full-sized versions here -
http://www.omaroo.net/albums/album47/20_min.jpg
http://www.omaroo.net/albums/album47/25_min.jpg
http://www.omaroo.net/albums/album47/30_min.jpg
Really starting to get some glow going now, although nowhere near as much as I was expecting still. Starting to also get quite a number of hot pixels. Each of these frames were taken and then the camera turned off for 10 minutes to cool - the idea being that there would be a stable reference point to start from each time.