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First of all, I don't think a one-size-fits-all number can be given. Some influencing factors I'd consider: Temperature? What works fine in April in Canada with the water still freezing every nig...
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First of all, I don't think a one-size-fits-all number can be given. Some influencing factors I'd consider: Temperature? What works fine in April in Canada with the water still freezing every nig...