When dealing with any short wires or electronics, a soldering gun does the job faster and more direct. You can use an iron of course, as long as you can quickly set your bead, and draw your line or seal (I agree with 5 seconds), ideally you'll want to draw any line or seal before your solder even sets up.
If you properly use your flux and an soldering gun, you shouldn't be able to remove you solder with a paring knife, after one shot. Immediate set with almost no heat transfer.
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