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Answer Wiki. Some knots can come out within a couple minutes. Others never come out. I've had extreme back and neck pain for the past year and a half, most of it just tension in my muscles. I've had numerous massages, taken other treatment, all to no avail.
A knot is a unit of speed that is equal to to one nautical mile per hour. A nautical mile is based on the circumference of the Earth and is used by sea and air navigators. It is approximately one minute of arc measured along any meridian. The symbol for knot is kn. There are 0.86897583 kn in mph.