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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.
You would have to say knots per hour if you wanted to say miles per hour. So, if we were going twelve knots per hour, that means were going thirteen point eight one two miles per hour. But as it stands, a knot is a mile, not a mile per hour.