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In my experience heat shrink tubing shrinks by about 50%. I use a hairdryer on it's hottest setting, use the nozzle attachment and hold it close to the tubing. I don't think I've ever needed to use it for as long as two minutes, maybe 30 seconds?

I buy my heat shrink from Farnell by mail order. They sell several different starting diameters and I think publish the technical specifications as well.

Hope this helps

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