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If using a dryer, 7 minutes is what a stylist once told me. She said it (the conditioner) doesn't do anything else after that. But I will say, if you're working with a conditioner that's rich in emollient ingredients, you can get more of a "soak" by leaving the product on longer.
For body heat, 15-30 minutes is sufficient.
With most conditioners, there is no harm in leaving them in longer. I wouldn't do it with conditioners that are heavy on protein though.