I've done light cures just overnight all the time -- it's going to depend on your prep though. Should I ask how they felt when you took them out of the brine? You're at a weird temperature. You're too hot for cold smoking and too cold for warm smoking. I typically smoke at about 150-200* until the IT is 140* or so -- usually 2-4 hours.... or I cold smoke for a 3-4 hours. I've never done tuna.
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