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I used to image with a 450D, a lot of imaging actually. I even installed a cold finger behind the sensor, so I know that camera pretty well. In its favour, the 450D is not a hot camera, as it doesn't have multiple processors and lots of sub routines generating heat. I would stick with short subs for the time being. It's summer, and hot nights are pretty common, you can't escape heat build up. If you were out at a dark site in the middle of winter, then much longer subs would be fine.
The comments on read noise, etc are relevant, so find the sweet spot for your camera; but if you were to switch over to an ultra low noise CMOS camera then the equivalency between many short subs and one long one becomes pretty true, especially if your using a cooled camera.
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