I left the camera sitting outside pointed north-ish for some long exposures last night.
This one was a 17.4 minute exposure, ISO 800, f/7.1 with the camera noise reduction turned on.
This one was a 30 miinute exposure, ISO 800, f/13 with the camera noise reduction turned off.
I tried a 60 minute exposure, but that one didn’t turn out because of condensation on the lens filter.