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No, don't try to stack them together. You need to stack each sub time separately (and calibrate with appropriate length darks) and then combine the separate masters with HDRComposition.
This is only worth doing with targets that have a high dynamic range. The Orion Nebula is a good example. The Helix is not a good example and doesn't need HDR.
Dunno about a tutorial. Warren Keller's IP4AP or Adam Block's adamblockstudios.com might be worth checking out.
Cheers,
Rick.
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