I have been doing this for a long time and in my experience it is normaly where it is located. I would try moving it and making sure that it is pointing downward but not straight down due to the fact that those nose cones hold water so at a slight angle and you could take a 8th inch drill bit and drill a hole in the hose cone so if and when it gets water in it will drain.

But to actually answer your question no they dont burn up very fast at all. I have seen a few that go out now and then but they should last a long time.

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