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I use to run my DSLR between 10mins for OSC and 20 Minutes for NB clip in filters just for the hell of it at ISO between 400 and 800 from sunny Sydney. I found that using a mains power supply helped, avoiding the summer and doing proper calibration was a must. Whether I got any value out of subs that long for RGB I never knew, twas early days in the hobby, but given I had an LP clip in filter for OSC I figured why not.
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