I find that when taking long exposures with my EOS R (anything from 30 secs to 4 minutes +) I get a lot more hot pixels than i ever did with my 6D MKII.
I appreciate that opening the RAWs in Photoshop or Lightroom removes the majority of them but still a nuisance. I wonder if this happens because mirrorless camera sensors heat up more than those on a dslr due to the focus method?
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Mirrorless cameras have a more compact form factor, so it is possible that the sensor will warm up when shooting longer exposures. As you may have noticed, we've added a feature to the camera to help address that called Long Exposure Noise Reduction.
Try doing tests with it set to AUTO at first, but then if you need something more robust, try doing tests with it set to ON.
This feature works by comparing the exposure to that of a black exposure of the same length and then subtracting the hot pixels that result. Note: when this feature is enabled, it will sometimes double the exposure length, so you may have to wait a few seconds before you can take another shot.
I hope that helps.
1. Use LENR as already mentioned above. It will take a dark frame for every exposure. Battery consuming.
2. Shoot dark frames yourself and substract in post. You will just need a few frames if you don't change your exposure settings.
3. Use a raw converter that is able to remove hot pixels and has a threshold slider.