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Until it's hot. It doesn't take very long generally. Clean pipe, no moisture in it, no breeze and a flame 3/4 to and inch long, 10 to 20 seconds should be enough. If there is moisture in the pipe, it will dissipate the heat and if it has water in it, you can't get it hot enough with propane.

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Q: How long do you hold a torch to a copper pipe?
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